$$$ Used by OS/2 to keep track of archived files 
0 Microsoft Flight Simulator texture file 
0 PSERVER printer queue information file 
000 CHKDSK found folder 
001 Unix system file 
001- Game resource file  
007 James Bond 007: Nightfire game file 
01 FIFA 2001 user file 
016 Formula 1 car race 2001 file 
1 Super Nintendo split ROM image 
113 Backup data file (Iomega Backup) 
12 Salt Lake city game music file 
123 Lotus 123 97 file 
12M Smartmaster file (Lotus 1-2-3 '97) 
16 Salt Lake City game music file 
1pa Microsoft Windows file 
1PH TurboTax File 
1ST Documenting wizard list (Microsoft Visual FoxPro) 
2 Saltlake city game music file 
2 Super Nintendo split ROM image 
2D Two-dimensional drawing file (VersaCAD)
2da BioWare Aurora engine 2-dimensional array file 
2da BioWare Infinity game engine AD&D rule set file 
2GR and 3GR VGA Graphics driver/configuration files (Microsoft Windows) 
2img XGS Apple IIGS emulator disk image format  
2mg XGS Apple IIGS emulator disk image format  
32 Raw Yamaha DX7 32 voice data 
32s Win32s file 
386 A file for use in an 80386 or higher microprocessor 
386 Microsoft Windows virtual device driver 
3D Three-dimensional drawing file (VersaCAD)
3di Delta Force object collection file 
3DM 3D NURBS modeler, (Rhino) 
3DS A file in 3D Studio (for DOS) format 
3DT 3D Topicscape Database File 
404 Muon DS404 bank file 
404 Muon DS404 patch file 
411 Data file (Used by digital cameras) 
49 Salt Lake city game music file 
4GE Compiled code (Informix 4GL) 
4GL Source code (Informix 4GL) 
4V Music file (Quartet) 
521 Murray State University Trojan Ring configuration file 
669 8 channels MOD 669 module 
669 Music mod file (Composer 669)(Unis Composer) 
669 Tracker module (Composer 669) 
7 IBM Voice Type Language Script Data file 
7Z 7-Zip Archive File 
8 Source file (Assembly) (Similar to Microsoft Assembler) 
8bc 8BallClub Billiards game playback file 
8svx Amiga 8-bit sound 
??? Yamaha A3000 sample file 
@@@ Screen files used in the installation and instruction on use of such applications as Microsoft Codeview for C
a Hellhog XP game archive 
A Library file (Unix) 
A Object code library 
a21 Soundweb firmware file 
a2b A2B Player playlist  
a2m AdLib Tracker 2 file 
a3k Yamaha A3000 sampler file 
A3L Authorware 3.x library 
A3M Authorware MacIntosh file (unpackaged) 
a3s Yamaha A3000 sample file 
A3W Authorware Windows file (unpackaged) 
A4L Authorware 4.x library 
A4M Authorware MacIntosh file (unpackaged) 
A4P Authorware file (packaged without runtime) 
a4w Disk image format 
a52 Atari 5200 game image file 
a52 Multichanel audio file 
A5L Authorware 5.x library 
A5W Authorware Windows file (unpackaged) 
a78 Atari 7800 image file 
AA Audible audio file (commonly used for downloadable audio books) 
aa Audible Audio file - downloadable audio books 
aa Generic CD image file 
aa Unix File 
aac Advanced audio coding 
aad FreeBSD file 
AAM Authorware shocked file 
aao America's Army map file  
aap Apollo Advanced Playlist  
aas Archos signed encrypted data 
AAS Authorware shocked packet 
aas Star Trek Elite Force bot support file  
aax Audible enhanced audio file 
AB Applix Builder file 
abc LithTech game engine 3D model file 
abc Musical notation language file  
ABF Adobe Binary Screen Font 
abg FIFA World Cup game data beart file 
abi ABI-Software development coder file 
abk AMOS music bank file 
ABK Backup file (PrintMaster Gold) 
ABK Corel Draw AutoBackup 
abk Need for Speed audio file 
ABM Audio album file (HitPlayer) 
abm Audition on-line dance battle  
abm HitPlayer music album file 
ABO Applix Builder Turbo file 
about each fax sent and received. 
abs AB SuDoKu save game  
abs Absolute Packager configuration file  
abs MPEG audio sound file 
ABS MPEG Audio Sound file 
ABS Sometimes used to denote an abstract (as in an abstract or summary of a scientific paper) 
ABS Standard GNU compiler output file for a PC platform 
abz AbszOrb 3D interactive game 
abz Alpha Black Zero game file 
AC$ AutoCAD Undo Info file 
ac3 Dolby Digital sound file 
ACA HTTP animation file (Microsoft Agent) 
ACA Project Manager Workbench file 
ACB ACBM Graphic image  
ACC DR-DOS Viewmax file 
accda Microsoft Access file 
accdb Office Access 2007 database file format 
accdc Microsoft Access file 
accde Office Access 2007 files that are in execute only mode 
accdr Access 2007 file that enables you to open a database in runtime mode 
accdt Access Database templates 
accdu Microsoft Access file 
ACD Character definiton file (Microsoft Agent) 
acd Sonic Foundry ACID audio file 
ACE ACE Archiver Compression file 
ace Train Simulator texture file 
ACF HTTP character file (Microsoft Agent) 
acf X-Plane description file 
acg Age of Wonders saved game 
ACI ACI development appraisal (ACIWEB) 
acl ArchiCrypt Live secured data file  
ACL Corel Draw 6 keyboard accelerator file 
acm Compressed sound file (Fallout 1.2, Baldur's Gate) 
ACM Dynamic Link Library (DLL) 
ACM Interplay compressed sound file (Fallout 1,2, Baulder's Gate) 
ACM Windows system directory file 
ACP Microsoft Office Assistant Preview file 
ACR American College of Radiology file 
ACS Character structered storage file (Microsoft Agent) 
ACT Action Presentation 
act ADPCM compressed audio file 
ACT Documenting wizard action diagram (Microsoft Visual FoxPro) 
ACT FoxPro Foxdoc Action Diagram 
ACT Microsoft Office Assistant Actor file 
act Train Simulator activity file 
ACV Used to Compress and decompress audio data 
AD After Dark screensaver 
ad AppleDouble encoded file 
ad UNIX application default resource file 
ad2 ADPCM 2-bit compressed voice file 
Ada Ada source text file (non-GNAT) 
ADB Ada source text body file (GNAT) 
adb AIMSS runtime project configuration file 
ADB HP 100LX Organizer Appointment database 
adba AIMSS author project configuration file 
ADC Scanstudio 16 color Bitmap Graphic file 
ADD OS/2 adapter driver file used in the boot process 
ade Audio file (ADC,TI/MIT) 
adf A.R.S.E.N.A.L game file 
ADF Amiga disk file 
adf Grand Theft Auto: Vice City file 
ADI AutoCAD device-independent binary plotter file 
adl Nova Logic game animation data batch listing file 
ADL QEMM Mca adaptor description library 
adl Westwood ADL file format 
adm Administrator policy template 
ADM After Dark MultiModule screensaver (Microsoft) 
adm NovaLogic game animation data map file 
ADM Windows NT policy template 
ADN Lotus 1-2-3 Add-In file 
adn Microsoft Access blank project template 
ADP Astound Dynamite file 
ADP Dynamic Page file (AOLserver) 
adp Fax modem interaction setup file 
ADP FaxWorks Faxmodem setup file 
ADR After Dark Randomizer screensaver 
ADR Smart Address address book 
ADS Ada source text specification file (GNAT) 
ADT AdTech Fax file 
ADT HP NewWave datafile for card applications 
adt Nova Logic game animation data triggers file 
adv Gravis Ultrasound virtual device driver 
ADX Archetype Designer Document 
ADX Dynazip Active Delivery script 
ADX Lotus Approach dBase Index 
ADZ Packed ADF file (Extracts with WinZip) 
AE Author/Editor file (SoftQuad) 
AEP ArcExplorer project file 
aep Game file 
aep Homeworld game file 
aes AES Crypt encrypted file 
aex Armored extracted public encryption key  
aexpk Armored extracted public key  
AF2 ABC FlowCharter 2.0 Flowchart 
AF3 ABC Flowchart 
AFC Apple Sound file 
afc Compressed audio interchange file format 
AFI Truevision Bitmap graphic 
AFM Adobe metrics 
AFM HP NewWave Cardfile application 
afp FileProtector encrypted file 
afp Gangsters game file 
afs Sega Dreamcast compressed audio file 
afs3 AFS 3 Basic encrypted file 
AG Applix graphic 
age3scn Age of Empires III 
agm Audio file 
ags Street Fighter IV game font file 
ahod Homeworld 
ahx WinAHX tracker module file 
AI Adobe Illustrator drawing 
AI Corel Trace drawing 
ai Rise of Nations game file 
aid Star Trek Armada arficicial intelligence parameters  
aif Audio Interchange File Format sound file 
AIF Audio Interchange File, a sound format used by Silicon Graphics and Macintosh applications 
aifc Audio Interchange File Format sound file with Compression 
AIFC Similar to AIF (compressed) 
aiff Audio Interchange File Format 
AIFF Similar to AIF 
aifr Audio Interchange File Format 
AIM AOL Instant Messenger Launch file 
AIN AIN Compressed archive 
ain NovaLogic game AI coordinates file 
AIO APL transfer file 
aip Nova Logic game AI perimeters file 
air Flight Simulator aircraft performance file 
AIS ACDSee Image Sequence 
ais Velvet Studio instrument 
AIS Velvet Studio Instruments file 
AIS Xerox Arry of Intensity Samples Graphic 
aiv Stronghold Crusader computer player AI 
AIX HP NewWave Cardfile Application data 
ajp AJP Player video file 
ajz Archos Jukebox Recorder firmware update 
akai Akai S-series floppy disk image file 
AKB HaleyAuthority Authority Knowledge Base File 
AKW Contains all A-keywords in the RoboHELP Help Project Index Designer not associated with 
al$ Midiprg Steinberg Cubase compressed file 
alaw A-law G.711 European telephony format 
ALAW European Telephony audio 
ALB JASC Image Commander album 
alb Raduga music playlist file 
alb Steinberg Cubase or VST backup song file 
alc Visual MP3 embedded dynamic lyrics 
alf Aipro 2000 landfiles 
ALI Document file (SAP proprietary format) 
ALIAS Alias Image 
all Aley's Module Format 
ALL Arts and Letters Library 
all Steinberg Cubase song file 
ALL WordPerfect for Windows General printer information file 
alr ADRIFT language resource file 
als Ableton Live project file 
ALS Alias Image 
als Arcade Lines graphic resource file 
ALT WordPerfect Library Menu 
alw A-law G.711 European telephony format 
alz DarkEden game file  
AM Applix SHELF Macro 
am Music file 
am1 Adventure Maker project file 
amd AMUSIC AdLib Tracker file  
amf ADRIFT module file 
amf Advanced Module Format music file 
AMF DSMIA/Asylum module music (Crusader,No Remorse,Aladdin) 
AMF Music file (Advanced Module Format) 
AMG ACTOR System image 
AMG AMGC Compressed Archive File 
AMI Annotation file (Cocreate SolidDesigner) 
amr Adaptive Multi-Rate compressed audio 
ams Extreme Tracker module 
AMS Extreme's Tracker Module 
ams Velvet Studio module 
AMS Velvet Studio music module (MOD) File 
amt ArtMoney table file 
AMU Sony Photo Album 
amz Amazon MP3 Downloader 
AN Text file (Sterling Software) (Groundworks COOL Business Team Model) 
ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors 
and others) 
ani Animated cursor 
ANI Microsoft Windows Animated cursor 
ani Painkiller Overdose game file 
anim Homeworld file 
ANM DeluxPaint Animation 
anm Jazz Jackrabbit 2 title sets image file 
ann Microsoft Windows Help annotation 
ANN Windows 3.x Help annotation 
ANS ANSI Text file 
ANT SimAnt for Windows saved game 
AOM Adobe After Effects Output Settings 
AOM Adobe Download Manager Online Manager Shortcut 
aon ArtOfNoise Amiga audio file 
aos Archos signed encrypted data file 
AOS Nokia 9000 Add-on software 
AOT Applicatio binary object template file (ZenWorks snAPPshot) 
AP Applix Presents file 
AP WHAP Compressed Amiga archive 
apac APAC compressed audio 
APC Compiled application file (Centura Team Developer) 
apc Cryo Interactive APC audio file 
APC Lotus 1-2-3 Printer driver 
apd Adobe PageMaker printer description 
APD Dynamic application library file (Centura Team Developer) 
apd IBM Lotus printer driver 
APD Lotus 1-2-3 Printer driver 
APE Monkey's Audio Lossless Audio Compression Format 
ape Monkey's Audio lossless audio compression format 
APE Winamp Plugins AVS File 
apex AVM Sample Studio bank file 
APF Lotus 1-2-3 Printer driver 
APF Project file (Allaire) (Created by Homesite) 
API Application Program Interface; used by Adobe Acrobat 
API Lotus 1-2-3 Printer driver 
api Lotus Printer driver 
apk Microsoft Train Simulator packaged activity 
apk Sound file 
APL APL Workspace file 
APL Application library file (Centura Team Developer) 
apl Monkey's Audio image link 
APP dBase Application Generator Object 
APP DR-DOS Executable Application 
APP FoxPro Generated Application 
APP Generated application or active document (Microsoft Visual FoxPro) 
APP Normal mode application file (Centura Team Developer) 
APP Symphony Add-in Application 
APR ArcView project file 
APR Employee Appraiser Performance Review file 
APR Lotus Approach 97 View file 
APS Advanced patching systems with error checking, (Similar to IPS) 
APS Microsoft Visual C++ file 
APT Lotus Approach Data view file 
APT Text mode application file (Centura Team Developer) 
apv Acerose password file 
apw Password file 
APX Borland C++ Appexpert database 
APX Lotus Approach Paradox-Specific information file 
AQ Applix data 
ar Linux/Unix command library 
Arago, Wordtech, xBase, and similar database or database-related products.  
ARC LH ARC (old version) compressed archive 
ARC SQUASH Compressed archive 
arch00 F.E.A.R. game archive 
architect Soundweb London design file 
Architecture" program) 
are BioWare Aurora Engine area 
ARF Automatic Response file 
arf Packmania 2 game archive 
arf WebEx advanced recording 
arh El Airplane game archive 
ARI ARI Compressed archive 
ARI Aristotle audio file 
ARJ Robert Jung ARJ compressed archive (ARJ) 
ARK ARC File Archiver CPM/Port archive 
ARL AOL v4.0 organizer file 
arl Aureal Aspen bank file 
arlc Commandos 2 Men of Courage game file 
army Impossible Creatures collection of created creatures 
arp Adobe Audition play data file 
ARR Atari Cubase Arrangement 
ART AOL Image file compressed using the Johson-Grace compression algorithm 
art Build game engine archive file  
ART Canon Crayola art 
ART Clip Art 
ART First Publisher Raster graphic 
ART Ray Tracer file 
ART Xara Studio drawing 
ARX ARX Compressed Archive 
ARX AutoCAD Runtime Extension 
AS Applix Spreadsheet 
ASA Microsoft Visual InterDev file 
ASC ASCII text file 
asc PGP (Pretty Good Privacy) signature 
ASC PGP armored encrypted file 
asc Pretty Good Privacy (PGP) armored encrypted file 
asd Ableton Live analysis file 
ASD Astound Presentation 
ASD Lotus 1-2-3 Screen driver 
ASD Microsoft Advanced Streaming Format (ASF) description file; opens with NSREX 
ASD WinWord AutoSave file 
ase Velvet Studio sample file 
ASE Velvet Studio Sample file 
asf Advanced Systems (streaming) format 
asf Electronic Arts Music File  
ASF Lotus 1-2-3 Screen font 
ASF Microsoft Advanced Streaming Format 
ASF Music file (Electronic Arts) 
ASF StratGraphics Datafile 
asg Airport Tycoon saved game 
ASH TASM 3.0 Assembly language header 
ashdisk Ashampoo backup file 
ashprj Ashampoo Burning Studio project file 
ASI Borland C++/Turbo C Assembler Include file 
asi Miles Sound System file 
aslquery MAC OS X console query 
ASM Assembler Language source file 
ASM Pro/E assembly file 
asnd Adobe Soundbooth sound document 
ASO Astound Dynamite Object 
ASP Active Server Page (an HTML file containing a Microsoft server-processed script) 
ASP Astound Presentation 
ASP Procomm Plus setup and connection script 
AST Astound multimedia file 
ast Audio stream file 
AST Claris Works "assistant" file 
ast Need for Speed Underground audio file 
ASV DataCAD Autosave file 
ASX Cheyenne Backup script 
ASX Microsoft Advanced Streaming Redirector file 
asx Microsoft Advanced Streaming Redirector file 
ASX Video file 
asxml XML music playlist 
AT2 Aldus Persuasion 2.0 Auto Template 
at3 Airport Tycoon 3 saved game 
at3 Playstation audio file 
atak Soundscape Audio-Take file 
atak1a Soundscape Audio-Take file 
atak4d Soundscape Audio-Take file 
atak?? Soundscape Audio-Take file 
ATM Adobe Type Manager data/info file 
atm The Universal 3D model texture file 
atn Extended audio data file 
atp Sony music format file 
ATT AT and T Group 4 bitmap 
att ZipLip secure e-mail 
ATW AnyTime Deluxe for Windows personal information manager file from Individual Software 
au Audacity audio block 
AU Audio U-law (pronounced mu-law) 
AU Sun/NeXT/DEC/UNIX sound file 
au Unix audio sound file format 
AUD Audio file (Westwood Studios) (Kyrandia 3,C and C,RedAlert etc.) 
aud DTS sound data stream file format 
aud Westwood Studios audio file 
aud Winamp media file 
auf Audacity block file 
aup Audacity project file 
AUP Audacity project file 
aur AutoREALM map file 
aus AutoREALM symbols 
aus Outpost Firewall Pro configuration 
AutoBackup 
AUX ChiWriter Auxilliary Dictionary file 
AUX TeX/LaTeX Auxilliary Reference file 
AVA Avagio Publication 
AVB Inculan Anti-Virus virus infected file 
AVG AVG Virus Information Database 
AVI Microsoft Audio Video Interleaved file for Windows movie 
avn altaVENTE application user notes 
AVR Audio Visual Research file 
avr Audio Visual Research sound file 
AVS Application Visualization System file 
AVS Stardent AVS-X Image 
AVX File Extension (ArcView) 
AW Applix Words file 
AW HP AdvanceWrite Text file 
AWD FaxView Document image 
AWE Acrobat Bookmark XML File 
awf Data sfx game file 
AWK AWK Script/Program 
AWM Animation Works Movie 
awp Akimbot Waypoint 
AWR Telsis file for digitally stored audio 
aws ActiveWords System 
AWS StatGraphics Data file 
aww AWW configuration 
ax ATI DA interface handler  
axa Annodex digital media format 
axe ChordMaster related file 
axe Compressed file 
AXL ArcIMS XML project file 
axp  CDBurnerXP audio compilation file 
AXT ASCII application object template (ZenWorks snAPPshot) 
AXX ARJ compressed file from a multi-volume archive (xx = a number from 01 to 99) 
axx Encrypted file 
ay Project file 
azd Amazon Software Download file 
azf Secure format file 
azs Secure format file 
azx ZX Audio file format 
B Applause Batch list 
b Grand Theft Auto III save file 
b LILO Boot Loader image 
b00 Blindwrite file 
b1 Cats Mah Jong Solitaire 
B1N 1st Reader Mono and color binary screen image 
B30 ABC Ventura publisher printer font 
B4 Helix Nuts and Bolts file 
b5i BlindWrite image file 
b5i DAEMON Tools 
b5l BlindWrite image file 
b5t BlindWrite image file 
b5t DAEMON Tools file 
b6i BlindWrite image file 
b6t BlindWrite table of contents file 
B8 Raw graphic file (Piclab Plane II) 
bad Nova Logic game bone animation data file 
BAD Oracle bad file 
baf BioWare Infinity game engine script 
bafl BurnAware Free compilation file 
bag Emperor: Battle for Dune game file 
BAK Backup file 
BAL Ballade Music score 
bam Bioware Infinity game engine graphics 
bam Bob's Adlib music format 
bam OHRRPGCE music file 
band GarageBand music project file 
BAND Garageband Project song 
bar Age of Empires 3 game file 
bar Age of Mythology game file 
BAR dBase Application Generator Horizontal menu object 
BAS BASIC source code 
BAT Batch file 
bau OpenOffice.org configuration file 
BB Papyrus Database backup 
bbg Game file 
bbk Game component file 
BBL TeX/BibTeX Bibliographic reference file 
BBM Deluxe Paint Bitmap image 
bbrkpuzzle Puzzle 
bbrksave Puzzle started status 
BBS Bulletin Board Sytem text 
bbz Audio file 
bbz Game executable file 
BCH Batch Process Object (dBase Application Generator) 
BCH Datalex Entry Point 90 Data file 
BCM Microsoft Works Communications file 
BCO Bitstream Outline font description file 
BCP Borland C++ Makefile 
bcs Bioware Infinity engine compiled script 
bcs Microsoft Windows 95 browse information file 
bcs Yamaha audio basic style 
BCW Borland C++ 4.5 Environment settings file 
bd BenDaglish audio file 
bd1 Map block location 
BDB Microsoft Works Dababase file 
BDF Egret Datafile 
BDF West Point Bridge Designer file 
bdp Combat Flight Simulator file 
BDR Microsoft Publisher Border 
bdr MS Publisher Document Border 
BEZ Bitstream Outline font description 
bf Beyond Good & Evil game archive 
bf Cryo Interactive game data 
bf Game archive file 
BF2 Bradford 2 Font 
bfa Blowfish-encrypted file 
BFC Windows 95 Briefcase Document 
bfe bcrypt - BlowFish file encryption 
bfl Colin McRae Rally 2 game file 
BFM Font Metrics file (Unix/Mainframe) 
BFX Fax document file (BitFax) 
BG Microsoft Backgammon Game file 
BGA OS/2 Graphic array 
bgi BGInfo configuration file 
BGI Borland Graphics Interface Driver 
bgl Microsoft Flight Simulator scenery data file 
BGL Microsoft Flight Simulator Scenery file 
bgw Music file 
bh3 Unit graphic file 
bha Unit graphic file 
BHF pcAnywhere Host file 
BI Binary file 
BIB Bibliography file (ASCII) 
BIB Database 
BIB TeX/BibTeX Literature Database 
bic BioWare Aurora game engine character sheet file 
bic Civilization III game scenario file 
bif BioWare Aurora game engine resource file 
bif BioWare Infinity game engine archive of resources 
BIF GroupWise initialization file 
BIF Image Capture Board Binary Image black and white graphic 
biff BioWare Infinity engine archive of resources 
BIFF XLITE 3D file 
big Command & Conquer Red Alert 3 game file 
big Command & Conquer: Generals archive file 
big Electronic Arts compression format 
big HomeWorld SGA archive 
big Need for Speed Undercover game file 
big The Lord of the Rings: Battle for the Middle Earth archive file 
bik BINK video file 
bin Audio format 
bin Binary file 
BIN Binary file 
bin CDRWin CD image file  
bin Cyberbykes game file 
bin Macbinary II encoded file 
bin Nova Logic game text strings file 
bin Sega Genesis game ROM 
bin X-Men Legends 2 game file 
bin Xpand Rally game archive 
bin64 Binary encoding method (used by mime complient mail readers) 
binary) 
binui Call of Juarez game menu file 
bio BioWare Infinity game engine character biography 
BIO OS/2 Bios file 
bit Worms imported map 
BIT X11 Bitmap 
bix Civilization III scenario 
bjo Instrument tablature file 
BK Backup file (Generic) 
BK JetFax Faxbook file 
BK! WordPerfect for Windows Document backup 
BK$ Backup file (Generic) 
BK1 WordPerfect for Windows Timed backup file for document window 1 
BK2 WordPerfect for Windows Timed backup file for document window 2 
BK3 WordPerfect for Windows Timed backup file for document window 3 
BK4 WordPerfect for Windows Timed backup file for document window 4 
BK5 WordPerfect for Windows Timed backup file for document window 5 
BK6 WordPerfect for Windows Timed backup file for document window 6 
BK7 WordPerfect for Windows Timed backup file for document window 7 
BK8 WordPerfect for Windows Timed backup file for document window 8 
BK9 WordPerfect for Windows Timed backup file for document window 9 
bkf Moto Racer game archive 
BKP TurboVidion Dialog Designer Backup 
BKS IBM BookManager Read bookshelf file 
BKS Microsoft Works Spreadsheet Backup 
BKW FontEdit Fontset mirror image 
BLB Resource archive (DreamWorks),(Neverhood) 
BLD BASIC Bloadable picture file 
bld RealFlight radio control airplane description 
bld Yoot Tower saved game 
blf BancTec scanner driver 
blf Microsoft Windows Vista file 
blf Rally Online car texture file 
BLK Alias Wavefront Image 
BLK WordPerfect for Windows Temporary file 
bln Rise of Nations campaign media 
blob Steam registry 
blp Blizzard game picture 
bls Blockland saved game 
blue EVE Online texture file 
bly FIFA World Cup game data fe art load game file 
blz Nokia N-Gage game file 
BM Windows system Bitmap 
BM1 Apogee BioMenace data 
BMA Song format used by Beatmania emulators 
bmc "IBM Voice Type" languages Newuser file 
bmd Nintendo GameCube 3D model 
BMF Binary Material File 
BMF Corel Gallery file 
bmk Bookmark file from Windows help 
BMK Windows Help bookmark 
BMP Windows or OS/2 bitmap 
bmpenx Encrypted BMP file 
bms Beatmania Music Simulator file 
bms BIOWRAP biometrically stamped and sealed file 
bms Nova Logic game binary map file 
bmu BioWare Music Unit 
bmx Nova Logic game mission save file 
BN Instrument bank file (AdLib) 
bn4 Yamaha DX100 voice 
bnc Bojanov Encryptor encrypted file 
bnd Microsoft Flight Simulator panels file 
bnd Neighbours From Hell game archive 
bnk Adlib instrument bank 
BNK Instrument Bank file (AdLib) 
bnk SimCity game data file 
BNK Sound effects bank file (Electronic Arts) 
bnk Yamaha DX100 voice SysEx dumps 
bnk Yamaha DX11 voice SysEx dump file 
bnt Entropia Universe game archive 
bochsrc Bochs configuration file 
boe Outlook Express backup 
BOL Compressed archive library file (Microsoft Booasm.arc) 
BOM Bill of materials file (Orcad Schematic Capture) 
boo Image file 
BOO Microsoft Booasm.arc Compressed archive 
BOOK Adobe FrameMaker Book 
bos Fallout Tactics game archive 
bot Game file 
box Cellblock Squadrons archive 
box FoxMail e-mail box 
box Lemmings Revolution archive 
BOX Lotus Notes file 
boxr Boxerjam interactive game system 
BPC Business Plan Toolkit Chart 
bpd Pscript Binary PostScript printer description file 
BPL Borland Delphi 4 packed library 
bpp MUSICMATCH Burner Plus project 
BPS Microsoft Works Document 
BPT CorelDraw Bitmap fills file 
BPX Truevision Targa Bitmap 
BQY BrioQuery file 
BR Bridge Script 
BR0 PrintMaster graphics file 
BR4 Bryce3D scene file
BRD Eagle Layout file 
brd Winning Bridge saved hand file 
bri Open Text FirstClass file 
BRK Brooktrout Fax-Mail file 
BRW Application file associated with financial institution(s) loan applications 
BRX A file for browsing an index of multimedia options  
BRZ DbBRZ file for very large Db backup or restore 
bs Infinity game engine compiled script 
BS1 Apogee Blake Stone data file 
BSA BSARC Compressed archive 
bsa Fallout 3 game data file 
bsb BioShock saved game 
BSC Apple II Compressed archive 
BSC Fortran Pwbrmake Object 
BSC MS Developer Studio (MSDev) browser information 
bsd FacetWin bitwise backup set file 
bsi BSI FutureComposer audio file 
bsi BSPlayer configuration 
bsl BSPlayer configuration 
bsm Bioshock map 
bsp 3D first person action game map file 
bsp Bioshock saved game file 
BSP Quake map file 
bst Star Trek: Birth of the Federation info file 
BS_ Microsoft Bookshelf Find Menu shell extension 
bt3 Control Runner button configuration file 
btf Baires Turf configuration file 
BTM Batch file used by Norton Utilities 
btoa Binary-to-ASCII file format 
BTR Database file (Btrieve 5.1) 
BUD Backup disk for Quicken 
BUG Bugs and Problems file 
BUN CakeWalk Audio Bundle (a MIDI program) 
bun CakeWalk audio bundle file 
bun Monkey Island 3 game archive 
bun Need for Speed Undercover game file 
BUP Backup 
bup Brother Embroidery system file 
BUT Buttons! Button definition 
BUY Movie data file 
BV1 WordPerfect for Windows Overflow file below insert point in document 1 
BV2 WordPerfect for Windows Overflow file below insert point in document 2 
BV3 WordPerfect for Windows Overflow file below insert point in document 3 
BV4 WordPerfect for Windows Overflow file below insert point in document 4 
BV5 WordPerfect for Windows Overflow file below insert point in document 5 
BV6 WordPerfect for Windows Overflow file below insert point in document 6 
BV7 Wordperfect for Windows Overflow file below insert point in document 7 
BV8 WordPerfect for Windows Overflow file below insert point in document 8 
BV9 WordPerfect for Windows Overflow file below insert point in document 9 
bvd CloneCD DVD information file 
bvs BVS Solitaire Collection file 
BW SGI Black and White image file 
BW Silicon Graphics Raw red,green and blue bytes file 
BWB Visual Baler Spreadsheet application 
bwd Car description file 
bwe Black and White 2 environment data file 
bwf Broadcast wave file format 
bwg BrainWave Generator file 
bwi Blindwrite cd copier file 
bwi BlindWrite CD/DVD image file 
bwp Painkiller Overdose game file 
BWR Kermit Beware buglist 
bwt Blindwrite disk image file 
bwu Blindwrite cd copier file 
BWV Business Wave file 
bww Bagpipe Player Software 
bwz WinImage batch configuration 
bxrc Configuration file 
BYU BYU Movie 
BZ Bzip compressed file (Inix) 
BZ2 Bzip compressed file (Unix) (replaces Bz) 
bz2 ZPoc user file list 
B_W Atari/Macintosh black and white graphic 
C C code 
c Check Point site configuration 
C Site configuration for Secure Remote (CheckPoint VPN) 
C-- Sphinx C-- Source code 
C00 Ventura Publisher Print file 
C01 Typhoon wave 
c01 Typhoon wave file 
c2c CopyToDVD project file 
c2d WinOnCD image file 
c4d Game object definition 
c4f Game round file 
c4g Game system file 
c4p Game player file 
c4s Game scenario file 
c4v Game video file 
C86 Computer Innovation (C86) Source code 
CA Telnet Server Initial cache data file 
cab Installation File For Windows Mobile 
CAB Microsoft cabinet file (program files compressed for software distribution) 
cab Microsoft Flight Simulator 2004 game archive 
CAC dBase IV Executable file 
cad Inago Rage compact arena definition file 
CAD Softdesk Drafix Cad file 
cae Caditor encrypted document file 
caf Apple Core Audio Format 
caf GarageBand Apple loop 
caf Tacx Fortius file format 
CAG Catalog file (Microsoft Clip Gallery v. 2.x,3.x,4.x) 
cakewalkwindowlayout Cakewalk Window Layout 
CAL Calendar schedule data file 
CAL CALS Compressed Bitmap 
cal Daqarta extended audio data 
CAL SuperCalc 4/5 Spreadsheet 
cam Abe's Oddysee background file 
CAM Casio camera file 
can Can Encryptor/Decryptor encrypted file 
CAN Navigator Fax 
CAP Compressed music file 
CAP Telix Session Capture file 
CAP Ventura Publisher Caption 
CAR AtHome assistant file 
car Carnivores Ice Age resource file 
car NASCAR Racing 2002 car description file 
car Railroad Tycoon 3 car properties file 
car Viper Racing car description file 
card Funkiball Adventure 
CAS Comma-delimited ASCII file 
cas Quest compiled adventure game 
cat Catz cat description file 
CAT dBase Catalogue file 
cat Fallout 3 file 
cat Microsoft Security Catalog file 
CAT Quicken IntelliCharge categorization file 
ca_ CakePro compressed audio file 
CB Microsoft clean boot file 
CBC CubiCalc Fuzzy Logic System file 
cbf Bioware Infinity game engine archive of resources 
CBF Vietcong (game) Pterodon big file 
CBI Column binary file (used in IBM mainframe systems) 
CBL Cobol Source code 
CBM XLib Compiled Bitmap 
CBR Comic book or paperback RAR file (decompress with RAR utility) 
CBT Generic Computer based training file 
CBZ Comic book or paperback ZIP file (decompress with WinZip or similar program) 
CC C++ Source code 
CC Visual dBASE custom class file 
CC3 Close Combat 3 file 
CCA cc
CCB Visual Basic Animated Button configuration file 
CCC Curtain Call Native bitmap graphic 
ccd CloneCD track description file 
CCD Elaborate Bytes Clone CD mapfile for creating and reading .img files 
CCE Data file (Calendar Creator Plus) 
ccf GPS Pathfinder Office configuration file 
ccf Lotus Symphony communications configuration file 
CCF Multimedia Viewer configuration file used in OS/2 
ccf OS/2 Multimedia Viewer configuration file 
CCF Symphony Communications Configuration file 
CCH Corel Chart 
CCL Intalk Communication Command Language 
CCM Lotus CC
CCO CyberChat data file 
CCO XBTX Graphics 
CCT Macromedia Director Shockwave cast file 
cct Railroad Tycoon 3 car type description 
ccx Total Annihilation: Counter-Strike  
cd CD description (DN) Disk Image 
CDA CD Audio Track 
cda CD Audio track 
CDB CardScan Database (CardScan) 
CDB Clipboard file 
CDB Conceptual model backup file (PowerDesigner) 
cdb FreeOTFE key file 
CDB TCU Turbo C Utilities Main database 
cdd Balder Multiboot configuration file 
CDF Microsoft Channel Definition Format 
CDF Netcdf Graphic file 
CDFS Compact Disk filing system (WindRiver) 
cdfs Microsoft Windows compact disk file system 
cdi CD Anywhere virtual CD file 
cdi Compact Disk Interactive Phillips CD-I IFF file 
cdi DiscJuggler image file 
CDI Phillips Compact Disk Interactive file 
CDK Atari Calamus Document 
CDM Conceptual data model file (PowerDesigner Data Architect) (Sybase) 
CDM Conceptual model file (PowerDesigner) 
cdm Music format (compressed) 
cdm Novell NetWare disk drivers NPA 
cdm NTI CD&DVD-Maker image file 
CDM Visual dBASE custom data module 
CDR Corel Draw Vector drawing file 
CDR Corel Vector Graphic Drawing File 
CDR Raw Audio-CD data file 
cdr RAW CD-format audio 
CDT Corel Draw template 
CDT CorelDraw Data file 
CDX Corel Draw compressed drawing 
CDX Microsoft's Visual Foxpro index 
cdz Cadenzo music file 
CE The FarSide Computer Calendar Main CE file 
CEF Cruzer encrypted file (used to secure files on Cruzer USB flash drives) 
CEG Tempra Show Bitmap graphic 
CEL AutoDesk Animator Cel Image 
CEL CIMFast Event Language file 
cel Constructor animation file 
CER Certificate file (MIME x-x509-ca-cert) 
CEX Caddie Exchange file 
cf Imake configuration file 
CF Imake Configurtion file 
cf Sendmail configuration file  
CFB Comptons Multimedia file 
cfe CryptoForge encrypted file 
cff BoomTracker 4.0 file 
CFG Configuration file 
cfg Configuration files 
cfg DataFlex configuration file  
cfg Delphi project configuration file 
cfg Norton Ghost configuration file 
cfg Pro/ENGINEER configuration file 
cfg ZEMAX configuration file 
CFL CorelFLOW Chart 
CFM ColdFusion template 
CFM Corel FontMaster file 
CFM Creative FM-Music 
CFM Visual dBASE Windows customer form 
CFN Atari Calamus Font data file 
CFO TCU Turbo C Utilities C form object 
CFP The Complete Fax Portable fax file 
cfs Inmos configuration file 
CGA Ventura Publisher Display font file 
CGI Common gateway interface script 
CGM Computer Graphic Metafile 
CH Clipper 5 Header 
ch OS/2 configuration file 
CH OS/2 configuration file 
CH3 Harvard Graphics 3.0 Chart 
CH4 Charisma 4.0 Presentation 
CHD FontChameleon Font descriptor 
CHF pcAnywhere remote control file 
CHI ChiWriter Document 
chi TOMBO encrypted file 
CHK File fragments saved by Windows Disk Defragmenter or ScanDisk 
chk Starcraft campaign map file 
chk TomTom Navigator voice file 
CHK WordPerfect for Windows Temporary file 
CHL Configuration History Log 
CHM Compiled HTML file 
CHN Ethnograph Data file 
cho Chord Pro song format 
CHP Ventura Publisher Chapter file 
chr Bioware Infinity game engine exported character info 
CHR Character Sets (Font file) 
CHT ChartMaster dBase Interface file 
CHT ChartViewer file 
CHT Harvard Graphics Vector file 
cht ZSNES cheat code file 
CIF CalTech Intermediate Graphic 
cif Easy CD Creator CD image file 
CIF Easy CD Creator image 
CIF pcAnywhere caller file 
CIL Clip Gallery download package file 
CIM Sim City 2000 file 
cin Nova Logic game cinematics file 
cin OS/2 change control file 
CIN OS/2 change control file that tracks changes to an INI file 
cip CryptoBuddy encrypted file 
CIX TCU Turbo C Utilities Database Index 
CK1 iD/Apogee Commander Keen 1 data 
CK2 iD/Apogee Commander Keen 2 data 
ck3 id Software Commander Keen game data file 
CK3 iD/Apogee Commander Keen 3 data 
CK4 iD/Apogee Commander Keen 4 data 
ck5 Commander Keen 5 data file 
CK5 iD/Apogee Commander Keen 5 data 
CK6 iD/Apogee Commander Keen 6 data 
CKB Borland C++ Keyboard mapping file 
CKF Casio Keyboard File 
CL Generic LISP Source code 
CL3 Layout file (Adaptec Easy CD Creator) 
CLASS Java class 
CLC TI-83 Plus Flash Debugger file 
CLG Disk Catalog database 
clk WatchGuard cloaked file 
CLL Cricket Software Clicker File 
CLO Cloe Image 
CLP Clipper 5 Compiler Script 
CLP Quattro Pro Clip art 
CLP Windows Clipboard 
CLR 1st Reader Binary color screen image 
CLR PhotStyler Color defintion 
CLS C++ Class Definition 
CLS Visual Basic Class Module 
CLX Adobe file 
CLX Macro ToolsWorks Macro file 
CLX Rational XDE file 
CM Craftman Data 
CMA Database file in plain text format (APPLIX TM1) 
cmb Reason Combinator instrument patch 
CMD 1st Reader External Command Menu 
CMD Command file for Windows NT (similar to a DOS .BAT file), OS/2 
CMD dBase-II program file 
CMD DOS CP/M command file 
cmd DOS CP/M command file 
CMF Corel Metafile 
cmf Creative Labs FM-synthesis music file 
CMG Chessmaster saved game 
cmi The Dig bundle file 
CMK Card Shop Plus file 
cml Crazy Machines saved laboratory file 
CMM CEnvi Batch file 
CMP Address document 
cmp Chord Pro song format 
CMP CorelDRAW 4.0 Postscript Printer Header 
cmp Freelancer physical model layout 
CMP JPEG Bitmap 
CMP Microsoft Word for DOS User dictionary 
CMP Route 66 Address Document 
cmp SWAT 3 compressed sound file  
cmp Technics Keyboard composer file  
CMR MediaPlayer Movie 
cmu Audio mono file 
CMV Corel Move animation 
CMX Corel Presentation Exchange image 
cmx Qualcomm CMX ringtone  
cmx The Sims 3D body mesh data 
CMYK Raw cyan, magenta, yellow, and black bytes file 
cnc Click 'n Create game file 
CNC CNC General Program data 
CNC3Campaign Command and Conquer 3 campaign save game file 
CNF Configuration file used by Telnet, Windows, and other applications with varying internal 
cnf Generaly configuration file 
cnf Lotus 1-2-3 configuration file 
cnf Microsoft Windows 95 speed dial file 
cnm Kerio WinRoute Firewall electronic mail file 
cnm Microsoft Windows application menu options and setup file 
cnm Pegasus Mail new mail message 
CNM Windows application menu options and setup file 
CNQ Compuworks Design Shop file 
cnt Hidden & Dangerous game file 
CNT Windows (or other) system content files for the help index and other purposes 
cnt Windows or other system content files 
CNV Conversion files (WS_FTP Pro) files that will be converted from (Example) "HTML-"HTM" for 
cnv Microsoft Word conversion file 
CNV Word for Windows Data conversion support file 
CNV WordPerfect for Windows Temporary file 
COB COBOL Source code 
cob Total Annihilation unit script 
COB trueSpace 2 object 
cod 3GPP AMR interface format 2 
COD dBase Application Generator Template source file 
COD FORTRAN Compiled code 
COD Microsoft C compiler output as displayable machine language/assembler with original C as 
COD Video Text file 
COE Xilinx coefficient 
COL AutoDesk Animator Color Palette 
COL Microsoft Multiplan Spreadsheet 
COM Command file (program) 
com Psion Organiser CommsLink setup file 
comments 
compile the source files of a Help system 
computer presentation 
con Battlefield 1942 configuration file 
con LucasArts container file 
con Microsoft Train Simulator identification file 
CON Simdir Configuration file 
con Unreal 2 audio file 
conf Configuration file 
conf Palace Server server configuration 
conf Psitree router configuration 
conf Unix/Linux configuration information 
config CRiSP Harvest config file  
config NET application configuration information 
config Rockbox configuration file 
config SWISH-E configuration file 
CP CryptoPad.NET Encrypted document 
CP8 CP8 256 Gray Scale image 
CPD Complaints Desk Script 
CPD Corel PrintOffice file (drawing) 
CPD Fax Cover document 
CPE Fax Cover document 
CPF CORDIS CPF Editor Contract Preparation Form Submission File 
CPF The Complete Fax (Fax file) 
CPH Image file (Corel Print House) see CPO 
CPI ColorLab Processed Image bitmap 
CPI Microsoft MS-DOS code page information 
cpi Microsoft MS-DOS code page information file 
cpi Microsoft Windows or DOS international code page 
CPJ CeQuadrant CD Project 
CPL Compel Presentation 
CPL Control Panel Module 
CPL Corel color palette 
cpl Microsoft Windows Control Panel extension 
CPM Turbo Pascal DOS file 
cpn Age of Empires campaign file 
cpn Rise of Nations campaign file 
CPO Image file (Corel Print Office) 
CPP C++ Source code 
CPP CA-Cricket Presents presentation 
CPR Corel Presents presentation 
cpr Patrician II game archive 
cpr Port Royale game archive 
CPS Central Point PC Tools Backup 
CPS Coloured postscript 
CPT CA-Cricket Presents Template 
cpt Casio song pattern file 
cpt CCRYPT encrypted file 
CPT Corel Photo-Paint image 
CPT dBase Encrypted Memo 
cpt dBASE encrypted memo file 
CPT Macintosh Compressed Archive 
cpt Nova Logic game converted poly terrain file 
cpx Age of Empires campaign file 
CPX Corel Presentation Exchange compressed drawing 
cpx CryptaPix encrypted image 
cpx Rise of Nations campaign file 
cpy Atari Ramdrive CPY commands 
CPY Data file (Copy Books) 
CPZ COMPOZ Music Text 
CRC Check file (Win-SFV32)(Fantasia Software) 
CRC Circular reference file (Pro/Engineer) 
crd Guitar chord file 
CRD Microsoft Windows 3.x Cardfile 
crd Spanish Whiz card game sound file 
crf System Shock 2 game archive file 
crf Thief game archive 
CRF Zortech C++ cross-reference 
CRH Image file (Microsoft Golf) 
crl Certificate revocation list 
CRP Corel Presents run-time presentation 
CRP dBase IV Encrypted database 
CRP Visual dBASE custom report 
crs Dance With Intensity file 
crs Links Games course file 
crs StepMania course file 
CRS WordPerfect 5.1 for Windows File Conversion resource 
CRT Certificate file 
CRT Crontab file) 
CRT Oracle Terminal settings information 
crt Soft Concert Karaoke file 
crt X.509v3 security certificate 
CRU CRUSH Compressed archive 
crv Daqarta extended audio data 
crysisjmsf Crysis saved game file 
cs Tribes 2 scripting file 
CS1 Sinar CaptureShop raw file for Macintosh 
CS16 Sinar CaptureShop raw file for Macintosh 
CS4 Sinar CaptureShop raw file for Macintosh 
CSA Comma deliminated text 
csb Street Fighter IV sound file 
csc 18 Wheels of Steel: Pedal to the Metal game file 
CSC Corel script 
csf Uefa champions league logic cutscene file 
CSG Statistica/w Graph file 
CSH C shell script files (Hamilton Labs) 
CSM Borland C++ 4.5 Precompiled header 
CSM Script file (Kodak Dc265 Camera) 
CSO Customer service data and outcome file 
CSP PC Emcee On-Screen image 
csr Fast SMS set SMS relay configuration 
CSS Statistica/w Datasheet 
CSS Stats+ Datafile 
CSS vCascading Style Sheet (MIME) 
CST Macromedia Director "Cast" (resource) file 
CSV Comma-separated values file 
CSV CompuShow Adjusted EGA/VGA Palette 
csv LucasArts The Secret of Monkey Island: Special Edition hint file 
csw Compressed square wave 
CT A graphic file associated with the Paint Shop Pro Graphic Editor 
CT Scitex CT bitmap 
CTB AutoCAD Color-dependent Plot Style Table 
CTC PC Installer Control 
CTF Symphony Character code translation 
ctfsys OS X Mach Kernel system file 
CTL dBase IV Control 
CTL Used in general for files containing control information. FAXWorks uses it to keep information 
ctp Civilization Call to Power archive 
CTX Microsoft Online Course Text 
CTX Pretty Good Privacy (PGP) Ciphertext file 
CTX Visual Basic User control binary file 
cub Validation module 
CUE ALCATech BPM Studio Cue Points 
CUE CDRWin (and others) Description File for a CD-Image 
cue Cue sheet description file 
CUE Microsoft Cue Cards Data 
CUL Cursor library file (IconForge) 
cup Roland Garros Tennis terrains file 
CUR Windows Cursor 
CURSOR Sun Microsystems Cursor 
CUT Dr Halo Bitmap 
CV Corel Versions archive 
CV Microsoft CodeView information screen 
cvf Jet-VoiceMail audio data 
cvf Train Simulator cab view file 
CVG Image 
CVS Canvas drawing file 
cwc CADfix wizard configuration file 
CWK Claris Works data 
CWS Claris Works template 
cxt Adobe Director protected cast file 
CXT Macromedia Director protected (not editable) "Cast" (resource) file 
CXX C++ source code 
cyp Cypherus encrypted archive 
cyr Crysis level file 
CZIP Encrypted Zip File 
czip ZG encrypted zip archive 
d00 Adlib sound file 
d00 Edlib Tracker mod compressed file 
D2D 2D/3D object file (3-D Fassade Plus) 
d2s Diablo II character data 
D64 Commodore 64 emulator disk image 
da Sony PlayStation CD-DA format 
da2 Star Trek Generations saved game file 
DAA PowerISO Direct-Access-Archive 
daa PowerISO Direct-Access-Archive file 
dac Sound file 
dam Dam file 
dao Disk at Once CD/DVD image file 
DAO Windows Registry Backup 
DAP Data access page (Microsoft Access 2000) 
DAR DVD Architect File 
DAT A data file extension used to designate an error message in a inbound internet email 
dat Act of War game file 
dat Against Rome game file 
dat Chuzzle saved game 
dat Commodore 64 audio file  
dat Constructor data file 
dat Daqarta extended audio data file 
DAT Data file 
DAT Extension used for some MPEG files 
dat Guild Wars data file 
dat Gunlok archive file 
dat Legacy of Kain Defiance game archive 
dat LEGO Star Wars game archive 
dat LithTech game compiled level file  
dat Nascar Racing game archive  
dat Nero BackItUp drive image 
dat Painkiller Overdose game file 
dat Propilkki game data 
dat Ricochet Lost Worlds: Recharged game archive 
dat Ricochet Xtreme game archive 
dat Runtime software disk image 
dat SHARP MZ-series emulator RAM-disk file  
dat Star Wolves game archive 
dat Uplink game archive 
dat Walkman NW-S23 MP3 file storage container 
dat Windows registry hive  
DAT WordPerfect Merge Data 
DAT Yahoo Messenger archive file 
data Arena Wars game data archive 
data SID Tune file 
dax Daxaif compressed audio 
daz DIABASS encrypted patient data 
DB Borderland's Paradox 7 table database 
db dBASE IV/dBFast configuration file 
db DIGIBooster module 
dbb Mopheus music file 
DBC Microsoft's Visual FoxPro database container file 
dbc OrCAD capture CIS database configuration 
DBF A dBASE file, a format originated by Ashton-Tate, but understood by Act!, Clipper,FoxPro, 
DBF Enable database (can be opened with Excel 97) 
dbf Nova Logic game dialog binary format 
DBF Oracle 8.1.x tablespace file 
dbi FiFa World Cup game data comin fe file 
DBK dBase Database Backup 
DBK Schematic backup file (Orcad Schematic Capture) 
dbl WindowsXP product activation file 
DBO Compiled program file (dBase IV) 
DBQ Paradox Memo 
DBS Managing Your Money data file 
DBS Microsoft Word printer description file 
DBS PRODAS data file 
DBS SQL Windows database 
DBT dBase Text Memo 
DBV Memo field file (Flexfile 2) 
DBW Microsoft Windows 9.x Database file (DataBoss) 
DBX DataBeam image 
DBX Microsoft's Visual FoxPro Table file 
dbx Outlook Express e-mail folder  
DBX Outlook Express mail folder 
DC CAD file (DesignCAD) 
DC2 CAD file (DesignCAD) 
dc4 ViaThinkSoft (De)Coder file 
DC5 DataCAD Drawing 
DCA Document Content Architecture Text file (IBM DisplayWrite) 
DCA Visual Basic Active designer cache 
dcf CANopen device configuration file 
dcf Copy Fast floppy disk image  
DCF Data file (Dyadic) 
DCF Disk Image file 
dcf Disk image file  
dcf DRM content format delivery file 
dcf DynSite configuration file  
dcf ProWORX Nxt database configuration 
DCIM Digital Imaging and Communications in Medicine (image and data) 
DCL AutoCAD Dialog Control Language Description file 
DCM DCM module 
dcm Sound file 
dco DisCryptor encrypted archive  
DCP Data CodePage (OS/2) 
DCR Shockwave file 
DCS Bitmap Graphics (Quark XPress) 
DCS Datafile (ACT! Activity file) 
DCS Desktop Color Separation file 
DCT Database Dictionary file (Clarion Database Developer) 
DCT Database SpellCheck Dictionary (Harvard Graphics 3.0-Symphony) 
DCT Microsoft's Visual FoxPro database container file 
dct StartSpanish dictation sound file 
dct Variable codec format designed for dictation 
DCU Delphi compiled unit 
DCX Bitmap Graphics file (Multipage PCX) 
DCX Fax image (based on PCX) 
DCX Macro file 
DCX Microsoft's Visual FoxPro database container file 
DD Compressed Archive (Macintosh DISKDOUBLER) 
dda DDA media file 
DDB Bitmap Graphics file 
DDF Btrieve or Xtrieve Data Definition File, which contains metadata describing a Btrieve or 
ddf Doom Definition File  
ddf Grand Theft Auto III game file 
DDI Image File (DISKDUPE) 
DDIF Digital Equipment or Compaq file. Used for storing images and their word processing 
DDP Device Driver Profile (OS/2) 
ddp OS/2 device driver profile file 
dds Battlefield 1942 unit or object texture file 
dds Crysis file 
dds Direct Draw surface 
dds Orbiter texture file 
dds Painkiller Overdose game file 
ddt Jill game file 
ddt Linux configuration file 
DEB Debug Script (DOS Debug) 
dec Magic: The Gathering deck of cards 
DEF Assembly Header file (Geoworks) 
DEF C++ definition file 
DEF Define Module file (3-D Fassade Plus) 
def Nova Logic game weapon profile file 
DEF SmartWare II data 
DEFI Oracle 7 de-install script 
DEM A file with USGS standards for Digital Elevation Models (Vista Pro) 
DEM Demo file (Descent) 
dem Descent demonstration 
DEM Graphics file (Vista Pro) 
dem Half-Life demo file 
dem Quake engine .DEM file format 
dem Tom Clancy's Rainbow Six 3: Raven Shield game file 
dem Unreal Tournament demo file 
DEP Visual Basic Setup Wizard Dependency file 
DER Certificate file 
des Interscope BlackBox file 
des Tribes 2 game file 
desklINK Desk Link 
DEV Device Driver 
dev Windows Device Driver file 
DEWF Macintosh SoundCap/SoundEdit recorded instrument file 
dewf SoundCap, SoundEdit recorded instrument 
dez DES encrypted zip file 
DEZ Encrypted zip file (DES Encryption) 
DFD Data Flow Diagram Graphic (Prosa) 
dff Grand Theft Auto III export format 
DFI Outline Font description (Digifont) 
DFL Default Program Settings (Signature) 
DFM Data Flow Diagram model (Prosa) 
dfm Digital-FM file 
DFS Sound File (Delight) 
DFV Printing Form value (Microsoft Word) 
DGN Bentley Systems drawing file 
DGN Microstation95 CAD drawing 
DGS Diagnostics Report 
DH Dependency Information file (Geoworks) 
DHP Graphic file (Dr. Halo II-III PIC Format) 
DHS Shadowgrounds Savegame File 
DHT Datafile (Gauss) 
DIA Diagraph Graphics file (Computer Support Corporation) 
DIB Device-independent bitmap 
DIC Dictionary file 
DIC Dictionary file (Lotus Notes, Domino) 
DICM Digital imaging and communications in medicine file (DICOM) 
DIF Data Interchange Format spreadsheet 
DIF Data Interchange Output file 
DIF Database file (VisiCalc) 
dif OS/2 display information file 
DIF Text file (Output from Data Interchange Format) 
DIG Digilink file 
dig Digilink sound format  
dig Sound Designer 1 file 
DIG Sound Designer I audio 
DIP Graphics file 
DIR Dialing Directory (ProComm Plus) 
DIR Directory (VAX) (DEC) 
dir Directory indicator  
dir Grand Theft Auto 3 game file 
DIR Macromedia Director file 
DIR Movie (MacroMind Director 4.x) 
dir Worms Armageddon game archive  
directory; when a file is accessed, information is compared with the VSN information to ensure 
DIS Distribution file (VAX Mail) 
DIS Ray Tracer file 
dis Soundweb firmware file 
DIS Thesaurus file (CorelDraw) 
DIZ Description file (Description in ZIP) 
DJS Data Junction Integration map 
DJS NASCAR Thunder game music file 
DJVU DjVu compressed image file 
DKB Graphics file (Ray Traced DKBTrace) 
DL Image 
dl Masked Dynamic Link Library file 
dl Zoo Tycoon 2 game file 
dlc Echelon HQ configuration file 
DLD Datafile (Lotus 1-2-3) 
dlg BioWare Aurora game engine conversation file 
dlg Bioware Infinity game engine dialog file 
DLG C++ Dialogue Script 
DLL Dynamic-link library file 
DLL Export/Import Filter (CorelDraw) 
dlm Dirty Little Helper cheat file 
dlm Dmailer encrypted file 
dlm Dynamic Link module 
dlp DirectMusic Producer DLS file 
dls Blood 2 file 
DLS Downloadable sound 
dls DownLoadable sound file 
DLS Interactive music architecture (IMA)(Microsoft),(Blood2) 
DLS Setup file (Norton DiskLock) 
dlu Dirty Little Helper update file 
dm DeltaMusic audio file 
DMD Visual dBASE data module 
dmf Delusion digital music file 
dmf DMF player ver 0.52B file 
DMF Packed Amiga disk image 
DMF X-Trakker music module (MOD) 
dmf XTracker digital music file 
dmg Apple Mac OS X disk image file 
DMG Macintosh disk image file (copy of contents of a hard disk or CD) 
dmo Build 3D game engine recorded games 
dmo Demo file 
DMO Demo file (Derive) 
dmo S3M compressed module 
dmo The Land Of UM demo file  
dmo Twin TrackPlayer file 
DMP Dump file (Screen or Memory) 
dmp Memory dump, screen dump, junk files... 
DMS Compressed Archive (Amiga DISKMASHER) 
dms Dream Maker script file 
dmu DigitalMugician audio file 
dm_57 Return to Castle Wolfenstein demo file 
dng IDsoft dungeon file 
dni realMyst 3D game archive 
do Disk image file 
DOB Visual Basic User document 
DOC DisplayWrite document 
DOC Document format (Interleaf) 
DOC FrameMaker or FrameBuilder document 
DOC Microsoft Word document 
DOC WordPerfect document 
DOC WordStar document 
docenx Egis encrypted Word DOC file  
docm Word 2007 XML macro-enabled document 
documents 
docx icrosoft Word 2007 XML based document file format 
docxenx Egis encrypted Word Open XML DOCX file  
DOG Screen Saver file (Laughing Dog Screen Saver) 
DOH Dependency Information file (Geoworks) 
doo Vibrants music file 
DOS External Command file (1st Reader) 
DOS Network Driver file (PKT_DIS.dos) 
DOS Text file (DOS) 
dot Bert's Dinosaurs game file  
DOT Line-Type definition (CorelDraw) 
DOT Word Document Template (Microsoft Word for Windows) 
dotm Word 2007 XML macro-enabled template file 
dotmenx Egis encrypted DOTM (Word 2007) file  
dotx Word 2007 XML template file 
dotxenx Egis encrypted DOTX (Word 2007) file  
DOX Text file (MultiMate 4.x) 
DOX User document binary form (Visual Basic) 
DOZ Description out of Zip (VENDINFO) 
DP Calendar file (Daily Planner) 
DP Datafile (DataPhile) 
dpc FUEL game data file 
dpc Twisted Metal 2 texture file 
dpc UEFA champions league data 
dpd Dekart Private Disk encrypted disk image 
DPL Borland Delphi 3 packed library 
dpm Darkplaces engine game movie information 
dpm DataPilot ring tone file 
dpr Dance Paranoia file 
DPR Project header (Borland C++) 
DPT Publication file (Publish-It!) 
dr8 DR-008 drumkit 
DR9 Directory file 
DRA Dragon NaturallySpeaking file 
DRAW Acorn's object-based vector image 
DRC Design rules check report file (Orcad Schematic Capture) 
DRG AllyCAD file 
DRG Motion Software Dyno2000 Car Design 
DRG VLBI and Tied Array Drudge Tasking Document 
drl Music source file 
dro DOSBox Raw OPL format 
drs Age of Empires 2 game file 
DRS Display Resource file (WordPerfect for Windows) 
drt DataPilot ring tone file 
drv Device Driver 
DRV Device Driver (Required to make a device function) 
DRV Driver 
DRW Caddie CAD drawing 
DRW Lotus Freelance image 
DRW Micrografx vector graphics file 
DRW Pro/E drawing 
ds Desktop Korn Shell file 
ds2 Olympus DSS Pro format 
DS4 Micrografx Designer Image 
DS4 Vector Graphics (Micrografx) 
dsb Rayman 2 play file 
DSC Discard file (Oracle) 
DSD Database file (DataShaper) 
dsf Delusion/XTracker digital sample 
DSF Micrografx Designer v7.x file 
dsf PC-TRUST document signer 
DSG DooM saved game 
dsi Digital Sound Module tracker format  
dsk Disk image file 
DSK Driver file (Novell Netware) 
dsk Novell NetWare disk driver 
DSK Project Desktop file (Borland C++/Turbo Pascal) 
dsk VMware virtual disk file 
dsm Digital sound module  
DSM Digital Sound Module (DSI) 
dsm Dynamic Studio music module  
DSM Dynamic Studio music module (MOD) 
DSM Music module file (DSIK) 
DSN Design (Object System Designer) 
dsn Microsoft OLE DB Provider for ODBC drivers 
DSN ODBC Data source 
DSN Schematic file (Orcad Schematic Capture) 
DSP Display parameters (Signature) 
dsp Dr.Halo graphics display driver 
DSP Graphics Display driver Dr. Halo) 
DSP Microsoft Developer Studio project 
DSQ Corel QUERY 
DSR Driver Resource (WordPerfect for Windows) 
DSR Visual Basic Active designer file 
dss Action Replay saved game 
DSS Digital Sound file (Digital Soup)) 
dss Digital Speech Standard file 
dss Olympus DSS file 
dss Screensaver file 
DSS Screensaver file (DCC) 
DST Distribution file (PC-RDist, by Pyzzo) 
DST Embroidery machines graphic file 
dst ViPNet products encryption key set 
DSW Desktop settings (Borland C++ 4.5) 
DSW Microsoft Developer Studio workspace file 
DSX Visual Basic Active designer binary file 
DS_Store Macintosh OS X Folder Information  
dt Macintosh file data fork 
dt1 Diablo II tile file 
DTA Datafile (Turbo C++) 
dta Hidden & Dangerous game file 
DTA World Bank's STARS data 
DTD SGML Document Type Definition (DTD) file 
DTED Digital terrain elevation data (geographic data format) 
DTF Database file (PFS-Questions and Answers) 
DTF Symantec QandA relational database 
dtm DeFy Adlib Tracker  
dtm DigiTracker/DigiTrakker module 
DTM Module file (DigiTrakker) 
DTP Desktop layout file (SecurDesk!/SecurDesk! LV) 
dtp SecurDesk! desktop file 
DTP Template file (Pressworks) 
DTP Text Document (Timeworks Publisher 3.x) 
dts Digital Surround Audio File Format 
DT_ Data file fork (Macintosh) 
dun Dial-Up Network config (Internet Explorer) file 
DUN Microsoft Dial-up Networking Export file 
DUP Duplicate Backup 
DUS Readiris font dictionary 
DV Digital video (MIME) 
DVC Datafile (Lotus 1-2-3) 
dvd DOS Device Driver File 
dvd elby CloneDVD image 
DVF Graphics file associated with camcorders (DV Studio) 
dvf Sony DV voice file 
DVI Binary file (TeX) 
DVI Device Independent Document (TeX) (LaTeX) 
DVP Desqview Program information (DESQview) 
DVP Device parameter file (AutoCAD) 
dvr Device driver file 
dw DavidWhittaker audio format 
DW2 Drawing file (DesignCAD for Windows) 
DWC Compressed Archive (DWC) 
dwd DiamondWare digitized file 
DWD DiamondWare digitized file 
DWF Drawing Web file (Microsoft WHIP autoCAD reader) 
DWF Vector graphic (Autodesk) 
DWG AutoCAD Drawing  
DWG AutoCAD drawing, or older Generic CAD drawing file 
DWH Express Tools log file 
DWI Stepfile format for Dance Dance Revolution simulator 
dwp Darwin Pond file 
DWP Document file (DeScribe) 
DWS Workspace file (Dyadic) 
dwt Demon's World game texture file 
dx Deus Ex map file 
DX Digital Electric Corporation (DEC) Data exchange file 
dx7 Raw Yamaha DX7-32 voice data 
dx7 Yamaha DX-series SysEx dumps  
DXB AutoCAD Drawing Exchange Format file 
DXF Data Exchange File 
DXF Drawing Interchange (eXchange) format,a text representation of the binary DWG format 
DXF Drawing Interchange Format (AutoCAD) 
DXN Fax document (Fujitsu dexNet) 
dxp CDBurnerXP data compilation file 
dxp Game related file 
DXR Macromedia Director protected (not editable) movie file 
dxr Vegas Jackpot Gold gamefile  
dxt LucasArts The Secret of Monkey Island: Special Edition texture file 
DYN Datafile (Lotus 1-2-3) 
E00 Coverage export file (ArcInfo) 
e00 Exchange file (Arc/Info) 
e4b EOS bank file 
ea EarAche audio file 
ear ETI Camcorder Pro audio file 
EASM SolidWorks eDrawing Electronic Assembly Data File 
EBJ Error Checking Object file (Geoworks) 
ebm Ragnarok online emblem 
ebp Relic Entertainment game file 
ec3 Dolby Digital AC3 sound file 
ecc Essential Taceo crypto container 
ecf Microsoft Exchange Server file 
ecm Error Code Modeler file 
ecr Ecrypt encrypted file 
ecw Ensoniq waveset format 
ECW RASTER structured graphics 
ecw System Dll file 
ECW VECTOR structured graphics files 
ed LithTech game level file 
ED5 EDMICS image 
ED6 EDMICS image 
eda Ensoniq ASR disk image 
EDA Ensoniq ASR disk image 
EDB ROOTS3 Geneological data file 
EDD Element Definition document (FrameMaker+SGML documents) 
ede Ensoniq EPS disk image 
EDE Ensoniq EPS disk image 
edf Digital Trainer encrypted score file 
edf RF Online texture sound and string archive 
edg EdG command file 
EDK Ensoniq KT disk image 
edk Ensoniq KT disk image 
edl Edlib module file 
EDQ Ensoniq SQ1/SQ2/KS32 disk image 
edq Ensoniq SQ1/SQ2/KS32 disk image 
EDS Ensoniq SQ80 disk image 
EDT Default settings (VAX Edt editor) 
EDV Ensoniq VFX-SD disk image 
edv Ensoniq VFX-SD disk image 
edx Ensoniq disk image 
ee Encrypt Easy encrypted file 
eea Encrypted E-mail Attachment 
EEB Button Bar for Equation editor (WordPerfect for Windows) 
efa Ecrypt 2005 encrypted file 
EFA Ensoniq ASR file 
efa Ensoniq ASR instrument file 
efc FAIRCOPY encrypted fair copy 
efc Technics Sx KN 6000 keyboard effect memory file 
EFE Ensoniq EPS file 
efe Ensoniq EPS instrument file 
EFK Ensoniq KT file 
efk Ensoniq KT instrument file 
efl Encryptafile encrypted file 
EFQ Ensoniq SQ1/SQ2/KS32 file 
efq Ensoniq SQ1/SQ2/KS32 instrument file 
efr Encryptafile Private Key file 
EFS Ensoniq SQ80 file 
efs Ensoniq SQ80 file 
EFT High Resolution Screen Font (ChiWriter) 
efu Encryptafile Public Key file 
EFV Ensoniq VFX-SD file 
efv Ensoniq VFX-SD instrument file 
efx Ensoniq instrument file 
EFX Fax document (Efax Reader) 
EFX Fax Document (Everex EFax) 
EGA EGA Display font (Ventura Publisher) 
egg Ducks add-on level file 
egisenx Egis encryped file 
EGM Bentley Systems drawing file 
ego RollbackRx drive image 
egs GIS Software encrypted grid shape file 
ekb SIEMENS Automation License Manager file 
EL Lisp Source code (eMacs) 
ELC eMac Lisp Source code (byte-compiled) 
ELM Theme-Pack file for (Microsoft FrontPage) 
ELT Event List Text file (Prosa) 
EMAIL Microsoft Outlook Express mail message (save to desktop, scan for viruses, then convert 
emb ABT extended module 
EMB Embedded bank File (Everest) 
emb Everest embedded bank file 
EMD ABT Extended MoDule 
emd ABT extended module 
EMF Enhanced Windows Metafile 
eml Email message 
EML Microsoft Outlook Express mail message (MIME RFC 822) 
emlx Mac OS X email message 
emp eMusic file format 
EMS Enhanced Menu System Configuration file (PC Tools) 
EMU Terminal Emulation Data file (BITCOM) 
emy EMelody, Ericsson mobile-ring tone 
emz Street Fighter IV game file 
EMZ Windows Compressed Enhanced Metafile, a graphic format used in Office and Visio 
enc CopySafe PDF encrypted file 
ENC Encoded file (UUENCODEd File, Lotus 1-2-3) 
enc Encoded file - UUENCODEd file (Lotus 1-2-3 - uuencode) 
enc ID software dungeon related file  
enc Media Safe encrypted data 
ENC Music file (Encore) 
enc My Personal Programmer encrypted distributed project 
ENC Video file 
END Arrow-Head Definition Table (CorelDraw) 
end Nova Logic game cinematics file 
ENFF Neutral Format 
ENG Chart Graphics file (EnerGraphics) 
ENG Dictionary Engine file (Sprint) 
eng RealFlight radio control airplane description 
eng Train Simulator engine file 
ent Entrust Entelligence secured file  
Enterprise Model) 
ENV Enveloper Macro (WOPR) 
ENV Environment file (WordPerfect for Windows) 
env HP-95 environment file 
env Motocross Madness 2 track file 
env Nova Logic game environment file 
env Sierra Print Artist envelope 
env Train Simulator environment file 
env X-Plane scenery file 
epb Constructor video file 
epc Jill game file 
EPD Publication file (Express Publisher) 
EPHTML Enhanced Perl-parsed HTML 
EPI Document file (Express Publisher) 
EPRT SolidWorkseDrawing CAD file 
EPS Encapsulated Postscript image file 
EPS Encapsulated Postscript Vector graphics (Adobe Illustrator) 
EPS Printer font (Epson, Xerox, Ventura Publisher) 
EPS2 Adobe Level II Encapsulated Postscript 
EPSF Encapsulated PostScript 
EPSI Adobe Encapsulated Postscript Interchange 
EQN Equation file (WordPerfect for Windows) 
ER1 ERWin file 
ERD Entity Relationship Diagram graphic file (Prosa) 
erf BioWare Aurora engine encapsulated resource file 
ERM Entity Relationship Diagram Model file (Prosa) 
ERR Compilation error file (Microsoft Visual FoxPro) 
ERR Stores the error messages that result when the RoboHELP Help Compiler attempts to 
ERX ERWin file 
es Serious Sam entity class 
ESH Extended Shell Batch file (DOS) 
ESL Distributable support library file (Microsoft Visual FoxPro) 
esm Europay security module  
esm Fallout 3 game data file 
esm The Elder Scrolls main game file 
esp Easy Setup program configuration file 
esp Fallout 3 plug-in file 
esp The Elder Scrolls III: Morrowind plug-in 
esp The Elder Scrolls IV: Oblivion plug-in 
ESPS ESPS audio file 
esps ESPS audio file 
ess The Elder Scrolls: Olbivion saved game file 
EST Interactive Cost Estimating 2000 file 
EST Microsoft Streets and Trips Trip File 
ESU ESRI Single Use License Information file 
esu LokSound Electronic Sound File 
ET EasiTeach document 
eta eTreppid Audio File 
ETH Document file (Ethnograph 3.x) 
ETX Structure Enhanced text (SetText) 
EUI Ensoniq ESP family compacted disk image 
eui Ensoniq ESP family compacted disk image 
evm Windows Vista session configuration file 
EVT Event Log (Microsoft Windows NT, 2000) 
evt Microsoft Windows evnent log file 
EVY Document (WordPerfect for Windows Envoy) 
EWD Text Document (Express Publisher for Windows) 
EWL Microsoft Encarta document 
EX3 Device Driver file (Harvard Graphics 3.x) 
EXC Exclude file for Optimize (do not process, QEMM) 
EXC Microsoft Word Exclusion Dictionary file 
EXC Source Code file (Rexx VM/CMS) 
EXE Executable file (program) 
exe Settlers 4 Save file 
exh NHL game exhibition roster file 
exl NSkill Neocron character builder file 
EXP Saved chat (ICQ) 
EXT ASCII binary transfer file (WS_FTP PRO) (IPSWITCH Software) 
EXT2 Second extended file system (Linux) 
EXT3 Third extended file system (Linux) 
EZP Compressed file (Edify.zip) (Edify Electronic Workforce Backup Utility) 
F Compressed file archive (FREEZE) 
F FORTRAN file 
F01 Fax document (Perfect Fax) 
F06 Dos screen text font (height= 6 pixels) 
F07 Dos screen text font (height= 7 pixels) 
F08 Dos screen text font (height= 8 pixels) 
F09 Dos screen text font (height= 9 pixels) 
F10 Dos screen text font (height= 10 pixels) 
F11 Dos screen text font (height= 11 pixels) 
F12 Dos screen text font (height= 12 pixels) 
F13 Dos screen text font (height= 13 pixels) 
F14 Dos screen text font (height= 14 pixels) 
F15 Dos screen text font (height= 15 pixels) 
F16 Dos screen text font (height= 16 pixels) 
f2r Farandole linear module format 
F2R Linear music module (Farandole) 
f32 Floating point raw 32-bit IEEE data 
f3d Moto Racer 3 bike model 
F3R Blocked music module (Farandole) 
f4a Adobe Flash MP4 audio stream file 
f4p Adobe Flash protected MP4 file 
f64 Floating point raw 64-bit IEEE data  
F77 Source code file (FORTRAN 77) 
F90 FORTRAN file 
F96 Fax document (Frecom FAX96) 
fac BioWare Aurora game engine faction file 
FAC Face graphic 
FAQ Frequently Asked Questions document 
far Farandole Composer music module 
FAR Music module (MOD) (Farandole Composer) 
far The Sims archive file 
FAS AutoCAD Fastload Auto LISP file 
FAS Basic module file (3-D Fassade Plus) 
FAV Navigation bar (Microsoft Outlook) 
FAX FAX Type image 
fbd F-22 Lightning Gravis joystick control file 
fbi Total Annihilation main unit definition file 
FBK Backup (Navison Financials) 
fbk FlashFXP backup configuration and user settings file 
fbz Shadowgrounds game archive 
FC Spell Check dictionary file (Harvard Graphics) 
fc13 FutureComposer file 
fc14 FutureComposer audio file 
FCD Virtual CD-ROM file 
fcd Virtual CDROM 
FCM Binary file patch (Forward Compression) 
fcm FC-M Packer song 
fcs Fantasy Football league organizer file 
FD Declaration file (FORTRAN) 
FD Field offsets for compiler (DataFlex) 
fda Warhammer 40,000 audio file 
FDB Database (Navison Financials) 
fdd Parallels virtual machine floppy disk drive image 
FDF Forms Document (Adobe Acrobat) 
fdi Disk2FDI floppy disk image file 
fdi Sinclair ZX Spectrum emulator floppy disk image 
fdp Protector Suite QL file 
FDW Document form (F3 Design and Mapping) 
FEB Button Bar for Figure Editor (WordPerfect for Windows) 
FEM CADRE Finite Element Mesh 
FES Topicscape file for fileless exports to Windows 
ff Call Of Duty game file 
ff Freedom Force game file 
ff Freedom Force vs The 3rd Reich game file 
FF Outline Font description (AGFA CompuGraphics) 
FFA MS find fast file 
ffa MS Office Find Fast status file 
FFF Fax document (defFax) 
fff Gravis Ultrasound PnP bank file 
FFF GUS PnP bank file 
ffl Aliens vs Predator game file 
FFL Image file (PrintMaster Gold) 
FFL MS fast find file 
ffl MS Office Find Fast document list 
ffn FIFA World Cup game data fe art file 
FFO MS fast find file 
ffo MS Office Find Fast document properties cache 
FFT Final Form Text (part of IBM's DCA) 
FFX MS fast find file 
fgp Folder Guard passwords file 
FH3 Aldus Freehand 3 drawing (Vector graphic) 
FH4 Aldus Freehand 4 drawing (Vector graphic) 
FH9 Macromedia Freehand 9 graphic file 
FI File Interface (FORTRAN) 
FIF Fractal Image 
FIG REND386/AVRIL file 
fil Constructor game file 
FIL File List Object (dBase Application Generator) 
FIL File template (Application Generator) 
FIL Overlay (WordPerfect for Windows) 
FILE AS/400 physical file 
fin AMD ATI Radeon video driver 
FIN Print formatted text (Perfect Writer) 
FINTRIS, ROL) 
FIT File index table (Microsoft Windows NT) 
FIT Graphic (FITS) 
FITS CCD camera image 
FITS Flexible Image Transport System file 
FIX Patch file (Generic) 
FKY Macro (Microsoft FoxPro) 
fl Freelancer saved game file 
fla Audio files encoded by Flac - free lossless audio codec 
FLA Movie (Macromedia Flash) 
flac Audio files encoded by Flac - free lossless audio codec 
FLAC Free Lossless Audio Compression file 
FLB Format library (Papyrus) 
flc Constructor animation file 
FLC FLIC animation (AutoDesk) 
FLD Field define module file (3-D Fassade Plus) 
FLD File folder (Charisma) 
FLF Delived form (Corel Paradox) 
FLF Driver (OS/2) 
FLF License (Navison Financials) 
FLI FLIC animation (AutoDesk) 
FLI Font library (EmTeX) 
flk File Lock file 
flk MYOB lock file 
FLL Distributable dynamic link library (DLL) (Microsoft Visual FoxPro) 
fll Visual FoxPro dynamic link library 
FLM Film Roll (AutoCAD) 
flmod Freelancer game archive 
FLO FlowCharter file (MicroGrafx) 
FLP Corel Flow Project Flow Chart 
flp Disk image file 
FLP Family Lawyer Saved Document 
flp FL (Fruity Loops) studio saved track file 
FLP FlipAlbum File 
FLP Floppy Disk Image File 
FLP Fractal Explorer Fractal Landscape Project 
FLP GIFLine V1.0 
FLP Promethean ACTIVboard file 
FLS Filelist document (Farrukh Imposition Publisher) 
fls Painkiller Overdose game file 
FLT Filter (Corel) 
FLT Filter (Micrografx Picture Publisher) 
flt Flight Simulator Game Saved File 
FLT Graphics filter (Microsoft) 
FLT Graphics filter support file (Asymetrix ToolBook) 
flt Miles Sound System file 
FLT Music module (MOD) (StarTrekker) 
FLT Open Flight file (MulitGen) 
flt OS/2 Warp Filter Device Driver  
flt StarTrekker Music Module file 
FLV Macromedia Flash Video file 
FLW Kivio flowchart file 
FLX Compiled binary file (DataFlex) 
FM FrameMaker Document (Adobe) 
FM Spreadsheet (FileMaker Pro) 
FM1 Spreadsheet (Lotus 1-2-3, version 2.x) 
FM3 Device driver (Harvard Graphics, version 3.0) 
FM3 Spreadsheet (Lotus 1-2-3, version 3.x) 
FMB Binary source code for form, (Oracle, v4.x and later) 
FMB File Manager button bar (WordPerfect for Windows) 
FMF Font or Icon (IBM LinkWay) 
FMK MakeFile (FORTRAN PowerStation) 
FML Mirror list (Oracle) 
fml WWE RAW character file 
FMO Compiled format (dBase IV) 
FMP Document file (FileMaker Pro) 
FMT Csreen format file (Microsoft Visual FoxPro) 
FMT Print file (Microsoft Schedule+) 
FMT Style sheet (Sprint) 
FMT Text format for form file (Oracle, v4.x and later) 
FMX Executable form, (Oracle,v4.x and later) 
FN3 Font (Harvard Graphics) 
FNC Fixed neighbors constraint file in RMC++ application 
FNC Functions file in a neural network application 
FND Saved Search (Find applet) (Microsoft Explorer) 
FNG Font group (Font Navigator) 
fnk FunkTracker module file 
FNK Module (FunkTracker) 
FNT Font (Generic) 
FNX Inactive font (Exact) 
FO1 Font (Borland Turbo C) 
FO2 Font (Borland Turbo C) 
FOG Fontographer font 
FOL Saved message folder (1st Reader) 
FON Call log (Procomm Plus) 
FON Dialing directory (Telix) 
FON Font (Generic) 
FON System font (Generic) 
font LucasArts The Secret of Monkey Island: Special Edition font file 
FOR Form (WindowBase) 
FOR FORTRAN source code 
forge Assassin's Creed game audio or data file 
formats 
fos Fallout 3 saved game file 
FOT Font-related file (Generic) 
FOT Installed TrueType font (Microsoft Windows Font Installer) 
Foundry) 
FP Configuration file (FoxPro) 
FP FileMaker Pro file 
fp Homeworld file 
fp Microsoft FoxPro configuration file 
FP1 "Flying Pigs" screensaver datafile (Microsoft Windows 9.x) 
FP3 FileMaker Pro v.3 and 4 document file 
FP5 Document file (FileMaker Pro v.5) 
FPC Catalog file (FoxPro) 
fpk Civilization IV game archive 
fpm FPS Creator map file 
fps FPS Creator project file 
fps Operation Flashpoint game file 
fpt Farandole Composer pattern 
FPT FileMaker Pro file 
FPT Memo fields (Microsoft FoxPro) 
FPW Floorplan drawing (FloorPlan Plus for Windows) 
FPX Bitmap (FlashPix) 
FR3 Renamed dBaseIII+ form (dBase IV) 
fra Fifa World Cup game data file 
frd Need for Speed game file 
fre FIFA 2002 data legal screen file 
fred FredEditor sound file 
FRF Font (FontMonger) 
FRG Uncompiled report (dBase IV) 
FRK Zip (compressed ) file (Macintosh) 
FRM Document (FrameMaker or FrameBuilder) 
FRM Executable file (Oracle,v3.0 and earlier) 
FRM Form (Generic) 
FRM Form (Visual Basic) 
FRM Merge form (WordPerfect for Windows) 
FRM Symbol Report (DataCAD) 
FRO Compiled report (dBase IV) 
from Atari 2600, Colecovision, Sega, Nintendo, etc.; not interchangeable between emulators) 
FRP Form (PerForm PRO Plus) 
FRS Screen Font Resource (WordPerfect for Windows) 
FRT Report menu (FoxPro) 
frw RollerCoaster Tycoon fireworks source 
FRX Form stash file (Visual Basic) 
FRX Report (Microsoft FoxPro) 
fs NetBSD system file 
fs6 Microsoft Flight Simulator panels file 
fsb Bioshock game sound file 
fsb FMOD sample bank format  
fseventsd MAC OS X file 
FSF fPrint Audit Tool 
fsh Coolfish encrypted file 
fsh EA Sports FSH format  
fsh Fifa World Cup game file  
FSL Form (Paradox for Windows) 
FSL Paradox 7 form (Borderland)  
FSL Saved form (Corel Paradox) 
fsm Farandole Composer WaveSample music format 
FSM Sample file (Farandoyle) 
fst FL Studio file 
fst GFI FAXmaker configuration file 
FST Linkable program (dBFast) 
FSX Data (Lotus 1-2-3) 
FT Full text index (Lotus Notes) 
FTB Index file (Roots3) 
FTF Client access data specification file (AS/400) (Client to Server) 
FTG Help system full-text search group file (Microsoft Windows) 
ftg Windows Help file 
ftm FaceTheMusic audio file 
ftm FamiTracker song file 
ftm Finale template file 
FTM Font (MicroGrafx) 
ftp Configuration (FTP Software PC/TCP) 
FTP File transfer protocol (Internet Generic) 
FTS Help system full-text search index (Windows)  
fts Windows Help index 
FTW Document file (Family Tree Maker) 
FW Database (Framework II) 
FW2 Database (Framework II) 
FW3 Database (Framework III) 
FW4 Database (Framework IV) 
FWB Data file backup for file splitting configuration (FileWrangler) 
FWP Microsoft FrontPage Web package (archive format for Web site content) 
fwp Worms Armageddon fiddler weapons module 
FWS Data file for file splitting configuration (FileWrangler) 
fx DirectX D3DXEffect object 
fx LucasArts The Secret of Monkey Island: Special Edition shader file 
FX On-Line guide (FastLynx) 
fxcb Crysis shader cache file 
FXD Phonebook (FAXit) 
FXP Compiled source code (FoxPro) 
fxp HALion sampler file 
FXS Fax Transmit graphic (WinFax) 
fxs The Land Of UM 
FZB Bank dump file (Casio FZ-1) 
fzb Casio FZ-1 Bank dump 
fzf Casio FZ-1 full dump 
FZF Full dump file (Casio FZ-1) 
fzv Casio FZ-1 voice dump file  
FZV Voice dump file (Casio FZ-1) 
G Data chart (APPLAUSE) 
g4b Sokoban++ level file 
G721 Raw CCITT G.721 //$bit ADPCM data 
g721 Raw CCITT/ITU G.721 4-bit ADPCM sound format 
G723 Raw CCITT G.723 3 or 5bit ADPCM data 
g723 Raw CCITT/ITU G.723 ADPCM sound format  
G723-3 Raw CCITT/ITU G.723 3-bit ADPCM sound format  
g723-5 Raw CCITT/ITU G.723 5-bit ADPCM sound format  
g726 Raw CCITT/ITU G.726 ADPCM sound data  
g726-2 G726-2 - Raw CCITT/ITU G.726 2-bit ADPCM sound format 
g726-3 G726-3 - Raw CCITT/ITU G.726 3-bit ADPCM sound format  
g726-4 G726-4 - Raw CCITT/ITU G.726 4-bit ADPCM sound format 
g726-5 G726-5 - Raw CCITT/ITU G.726 5-bit ADPCM sound format  
G8 Raw Graphics (one byte per pixel) Plane III (PicLab) 
gadget Windows sidebar gadget file 
gaf Total Annihilation image format 
GAL Album (Corel Multimedia Manager) 
gam Baldur's Gate game file 
gam CyberBoard game file 
gam Dark Engine game file 
GAM Fax document (GammaFax) 
gam Infinity game engine saved game 
gam Klik'n'Play game 
gam Rise of Nations saved game 
gam RPG Toolkit game project 
gam TADS game file 
gam Tasc Chess CD II saved game 
gam The Games Factory game 
gam Vectrex game file 
game Command & Conquer Red Alert 3 file 
GB Emulator ROM image file (Nintendo GameBoy) 
gb Nintendo Gameboy ROM image (game file) 
GBC Color emulator ROM image file (Nintendo GameBoy) 
gbi gBurner image file 
GBL Global definitions (VAXTPU Editor) 
GBL Global file 
GBM Genie Backup Manager file 
gbx Nadeo Games File Format 
GC1 Lisp source code (Golden Common Lisp 1.1) 
GC3 Lisp source code (Golden Common Lisp 1.1) 
GCD Generic (TM) CADD drawing (later versions) 
gcd Prassi CD image 
gcd Prassi Global-CD disk image 
gcf Half-Life 2: Episode Two game cache file 
gci GTA2 Game File 
gcm GameCube image file 
GCP Image processing file (Ground Control Point) 
gcs GameShark SharkSave for GameCube 
GDB Database file (InterBase) 
GDF Dictionary file (GEOS) 
GDM Bells, whistles, and sound boards module 
gdm Bells, Whistles, and Sound Boards module  
GED Genealogical data (GEDCOM) 
ged GoldED/DOS compiled configuration file 
GED Graphic Environment Document (drawing) 
GED Graphics editor file (EnerGraphics) 
GED Graphics editor native format (Arts and Letters) 
GEM Metafile (GEM) 
GEM Vector graphics (Ventura Publisher) 
GEN Compiled template (dBase Application Generator) 
GEN Generated text (Ventura Publisher) 
GEO Geode (Geoworks) 
geo GoldED / OS/2 compiled config file 
geo Homeworld geometry file 
GetRight Unfinished-Download (GetRight) 
gex GEcho config file 
GFB Compressed gif image (GIFBLAST) 
GFC Patton and Patton Flowcharting 4 flowchart 
GFI Graphics Link presentation (Genigraphics) 
gfs Microsoft Office Groove remote file 
GFT Font (NeoPaint) 
GFX Genigraphics Graphics Link presentation 
GHO Symantec ghost image file 
ghs Glider Pro house file 
ghs LaserTank high scores 
GHS Symantec ghost segment file (automatically spanning files over 2 GB in size) 
gi File created by burning software 
gi! GigaSampler/GigaStudio split file 
GIB Chart (Graph-in-the-Box) 
gic BioWare Aurora Engine area file 
GID Windows 95 global index (containing help status) 
GIF Bitmap (CompuServe) 
gifenx Egis encrypted GIF file  
gig GigaSampler/GigaStudio file 
GIM Graphics Link presentation (Genigraphics) 
git BioWare Aurora game engine area file 
GIW Presentation (Graph-in-the-Box for Windows) 
GIX Graphics Link presentation (Genigraphics) 
gjd 7th Guest game archive 
gjd The 11th Hour game file 
GKH Ensoniq EPS family disk image 
gkh Ensoniq EPS family disk image 
GKS GripKey document (Gravis) 
GL Animation file (GRASP graphical System for Presentation) 
gl Star Crusader archive file 
GLB Microsoft Exchange Server resynchronization file 
GLB Textured 3-D scene file format 
glf Golf save file 
GLM Datafile (Glim) 
GLS Datafile (Across) 
glue GlueMon audio file 
GLY Glossary (Microsoft Word) 
gm Transport Tycoon game music file  
gm2 Heroes of Might & Magic III saved game 
gm4 Heroes of Might & Magic III saved game 
GMF CGM Graphics (APPLAUSE) 
gml NetRemote XML-based configuration file 
GMP Majesty Savegame File 
GMP Tile map (Geomorph) (SPX) 
gmr Game Maker compiled game file 
GMR Graphical monitor record (Schlafhorst Automation) 
gmv Cyberboard move 
GNA Graphics Link presentation (Genigraphics) 
GNO Genealogy document file (Genopro) 
GNT Generated executable code (Micro Focus) 
GNX Graphics Link presentation (Genigraphics) 
gob Dark Forces game data 
gob Indiana Jones 3D game archive 
gob Jedi Knight game archive 
GOC Goc sorce code (Geoworks) 
GOH Goc header (Geoworks) 
GP Geode parameter file (Geoworks Glue) 
GP3 Guitar Pro 3 file 
gp3 Guitar Pro 3 project 
gp4 Guitar Pro 4 project 
gpd Microsoft Windows XP printer driver file 
gpg GNU Privacy Guard public keyring file 
GPH Graph (Lotus 1-2-3/G) 
GPK Program package (Omnigo) 
GPP Graph paper application file (GraphPap) (Generates graph paper) 
GR2 Screen driver (Microsoft Windows 3.x) 
GRA Datafile (SigmaPlot) 
GRA Graph (Microsoft) 
gra Microsoft Flight Simulator file 
grb MS-DOS Shell Monitor file 
GRB Shell Monitor (MS-DOS v5.0) 
grd Gradebook Power configuration file  
GRD Image processing grid (CHIPS) 
grd StrongDisk encrypted disk image 
GRF Graph (Charisma Graph Plus) 
GRF Grapher (Golden Software) graph 
GRM Minos File 
grm Nova Logic game facial expressions file 
GRM VISUAL EPR Input Data for FIntGraf 
gro Serious Sam game file 
gro Warlords Battlecry game archive  
group Linux file 
GRP Pictures group (PixBase) 
GRP Program Manager Group (Microsoft) 
grp StarCraft graphics group file 
grp Windows Program Group file 
grv Microsoft Office Groove file 
GRY Raw graphic (GREY) 
GS1 Presentation (GraphShow) 
gsa Microsoft Groove template or working space archive 
GSD Vector graphic (Professional Draw) 
GSM Audio stream Raw 'byte aligned (GSM 6.10 audio stream) 
GSM Audio stream Raw GSM (6.10 audio stream) 
GSM GSM w. header/QuickLink file (US Robotics voice modems) 
GSM GSM w.o. header/VoiceGuide/RapidComm file (US Robotics voice modems) 
gsm Raw GSM 6.10 audio stream file 
gsm Sound (GSM 6.10 prI-ETS 300 036 13kbit/s) (Internet phones) 
GSP Sketch pad file (GeoMeter Sketch Pad) 
GSP Zip file (Gnuzip) (Allows for output to html) 
gst Need for Speed file 
GSW Worksheet (GraphShow) 
GT2 Music module (Graoumftracker) (new) (MOD) 
GTH IBM Gatherer file 
GTH Lotus Domino document manager file 
GTK Music module (Graoumftracker) (old) (MOD) 
gtp Guitar Pro project 
GUP Data (PopMail) 
GVL RCL Software Gravel (astronomy simulator) file 
GVP Google Video Pointer 
GWI Novell GroupWise file 
GWP Greetings WorkShop (now Microsoft Picture It) file 
gwp Greetings WorkShop file 
GWX Graphics Link presentation (Genigraphics) 
GWZ Graphics Link presentation (Genigraphics) 
GXL Graphics library (Genus) 
gxt Grand Theft Auto 2 game file 
GZ Compressed file (Unix gzip) 
gzp Giants: Citizen Kabuto 
H Program header (C) 
H! On-line Help (Flambeaux Help!) 
H++ Header file (C++) 
H-- Header file (Sphinx C--) 
h1c Windows Vista file related to Assistance Platform (AP) help 
h1f Microsoft Windows Assistance Platform client help file 
h1k Keyword index Microsoft Windows Assistance Platform client help related file 
h1s Microsoft Windows Assistance Platform client help file 
h1t Microsoft Windows Assistance Platform client help related file 
h1v Task metadata file Microsoft Windows Assistance Platform client help related file 
HA Compressed archive (HA) 
hak BioWare Aurora engine file 
hal Mortyr game archive  
HAM Driver file (Novell Netware) 
HAM Vector graphics saved file (Amiga) 
HAP Compressed archive (HA) 
HBI Handy Backup file 
HBK Accounting data file (Humanic Software) 
HBK Handbook (MathCad) 
HCM Configuration file (IBM HCM) 
HCOM Sound Tools file (HCOM) 
hcom Sound tools HCOM format (Macintosh) 
hcr IBM HCD/HCM production configuration file 
HCR Production configuration file (IBM HCD/HCM) 
hdd Parallels Workstation virtual hard disk file 
HDF Amiga Hardfile Image 
HDF Help file (Help development kit) 
HDF Hierarchical Data Format file 
HDF National Center for Supercomputing Applications (NCSA) Geospatial Hierarchical Data 
HDF Procomm Plus Alternate Download file listing 
HDL Alternate download listing (ProComm Plus) 
HDMP Windows Heap Dump file 
HDR Database header (Pc-File+) 
HDR Datafile (Egret) 
HDR Message header text (1st Reader) 
HDR Message header text (ProComm Plus) 
hds Windows Digital Right Management file 
hdv Disk image file 
HDW Vector graphics (Harvard Draw) 
HDX Help index (AutoCAD) 
HDX Help index (Zortech C++) 
HED Document (HighEdit) 
HEL Hellbender saved game (Microsoft) 
hex HUGO game file 
HEX Macintosh BinHex 2.0 file 
hex Macintosh BinHex encoded file archive (ASCII) 
HFI HP font info (GEM) 
HGL Drawing file (HP Graphics Language) 
hgt Battlezone game data file 
hh HammerHead drumloop file  
HH Header file (C++) 
HH Help system map (Generic) 
hhc HTML Help Table Of Contents file 
HHH Precompiled header (Power C) 
hhk MS HTML Help Index 
HHP Help information for remote users (ProComm Plus) 
hi High scores file 
hid Sony Ericsson configuration archive 
hil DSJ 3 Hill file 
hip Hippel audio file 
HIT Audio file (HitPlayer) 
hiv Windows NT Registry Hive 
hke Painkiller Overdose game file 
HLB Help library (VAX) 
HLP Help file (Generic) 
hlp Microsoft help file 
HLP Windows Help file (DataCAD) 
HMI Human machine interfaces MIDI music file (Descent) 
HMM Alternate mail read option menu (ProComm Plus) 
HMP Human machine interfaces MIDI music file (Descent) 
HNC Program files (CNC) 
hog Descent hog file 
HOG Lucas Arts Dark Forces WAD file 
HOG Main data package file (Descent3) 
HOG Mission file (Descent 1-2) 
HOT Document file (HotSend) 
HP8 Ascii text Roman8 character set (NewWave Write) 
HPC Font language file (Hewlett-Packard) 
HPF HP LaserJet font (Adobe Pagemaker) 
HPF Partial download file (HotLine) 
hpg Hide Photos encrypted photo container 
HPG HPGL Plotter vector graphics (AutoCAD) 
HPG HPGL Plotter vector graphics (Harvard Graphics) 
HPI Font information (GEM) 
hpi Total Annihilation game archive 
HPJ Help Project file (Visual Basic) 
HPK Compressed archive (HPACK) 
hpk Imperium Romanum game data file 
HPM Alternative menu for privileged users (ProComm Plus) 
HPM Emm text (HP NewWave) 
HPP Header file (Zortech C++) 
HPP Program header (C++)  
HQX BinHex (Macintosh 4.0) 
HRF Rastor graphic (Hitachi) 
HRM Alternate menu for limited users (ProComm Plus) 
HS2 Monochrome image (Postering) 
HSC FM synthesized music file (Used by many old games, e.g.
hsc HSC tracker 2-op FM music file 
hsf Lizard Protector Web Content Security protected web content 
hsh Microsoft IIS NNTP hash file 
HSI Graphic (Handmade Software, Inc.) 
hsp HSC composer packed by Number Six 
HST History file (Generic) 
HST History file (ProComm Plus) 
HT HyperTerminal file 
HTA A HTML file that has been used to by viruses to update the system registry 
htaccess Apache access configuration file 
HTC HTML Component 
HTM A Web page (a file containing Hypertext Markup Language HTML markup) 
HTML A Web page (a file containing Hypertext Markup Language HTML markup) 
htmlenx Egis encrypted HTML file 
HTT Hypertext template (Microsoft) 
htt Microsoft HyperText Template file 
HTX Template (Extended HTML) 
HWD Presentation (Hollywood) 
HWP Korean word processor document format (HanGul) 
hxi Microsoft Help compiled storage file 
HXM Alternate protocal selection menu (ProComm Plus) 
HXM HAM extension (Descent2) 
hxs Microsoft Help compiled storage file 
HXX Header file (C++) 
HY1 Hyphenation algorythm (Ventura Publisher) 
HY2 Hyphenation algorythm (Ventura Publisher) 
HYC Datafile (WordPerfect for Windows) 
HYD Hyphenation dictionary (WordPerfect for Windows) 
HYM 3D Image binary file (Hymarc Scandata Scanner) 
HYP Compressed archive (HYPER) 
I Intermediate file (Borland C++) 
i00 Splited mds disk image file 
I00 WinShrink File (I-zero-zero. Usually followed with 1 or more .i0x files, and .md5 file) 
i01 Splited disk image file 
i02 Splited disk image file 
i03 Splited disk image file 
i04 Splited disk image file 
i05 Splited disk image file 
i3d Hidden and Dangerous file 
ia Roland Garros tennis persons file 
iaf Informer configuration 
iaf Quikscribe intelligent audio file 
iai Nova Logic item attributes info 
IAN Text file (Sterling Software) (Groundworks COOL Business Team Model) 
IAX Bitmap (IBM Image Acess eXecutive) 
ibk Sound Blaster FM instrument bank 
IBM Compressed archive (ARCHDOS, IBM Internal only) 
ibp IsoBuster Managed Image Information File 
ibq IsoBuster Managed Image File 
ICA Bitmap graphic (Image Object Content Architecture) 
ICA Citrix file 
ica Identity Compass encrypted answers  
icap Internet preference file 
ICB Targa bitmap 
ICC Catalog file (IronClad) 
ICC Printer file (Kodak) 
ICD Drawing file (IronClad) 
icd Dungeon Keeper 2 game file 
icd Rayman 2 game file 
icd SafeDisc encrypted digital rights management file 
ICL Icon Library (Generic industry standard) 
ICM Image Color Matching profile 
icn Bert's Dinosaurs file  
ICN Icon source code 
ICO Icon (Microsoft Windows 3.x) 
icp Identity Compass encrypted profile 
ics CopyControl Generic Copier floppy disk image 
ICS Scene file (IronClad) 
ID Disk identification file (Generic) 
IDB Intermediate file (Microsoft Developer) 
idb PocoMail index file 
IDD MIDI Instrument Definition 
IDE Project file (Borland C++ v4.5) 
IDF MIDI Instrument Definition (Windows 95 required file) 
IDIF Identification file (Netscape saved address book) 
IDL OMG Interface Definition Language (IDL) file 
IDQ Cognos Impromptu Query Definition 
IDW Vector graphic (IntelliDraw) 
idx Corel QuickFinder index 
idx Forte Agent file 
idx Index file 
IDX Index file (Microsoft Clip Gallery v. 1.x) 
IDX Index file (Pro/Engineer) 
IDX Microsoft Outlook Express file 
idx Microsoft Outlook Express index file 
idx NoX game file 
idx PocoMail index file 
IDX Relational database index (Microsoft FoxPro) 
IDX Relational database index (Symantec QandA) 
IFD Adobe Output Designer forms definition source file 
IFD Form (JetForm Design) 
iff Amiga sound file 
IFF Image (Sun TAAC/SDSC Image Tool) 
IFF Interchange file, (general purpose data storage format)) 
iff The Sims data file 
ifl Descent 3 ship graphic file 
ifl Nova Logic build info listing file 
ifo BioWare Aurora game engine information file 
IFO Digital Video Disk (DVD) datafile 
IFO Graphic object layer data (ImageForge Pro) 
IFP Script file (KnowledgeMan) 
IFS Compressed fractal image (Yuvpak) 
IFS Create executable library (ImageForge/ImageForge Pro) 
ifs InfoSlips secure information package 
ifs OS/2 installable file system 
IFS System file (OS/2) 
ifu All Image image file 
ifz All Image compressed image file 
IGES Initial Graphics Exchange Specification (Generic) 
IGF Metafile (Inset Systems) 
IIF Interchange file (QuickBooks for Windows) 
IIM Music module 
il Icon library file 
ILB Datafile (Scream Tracker) 
ILBM Bitmap (graphic image) 
ILK Program outline (Microsoft ILink incremental linker) 
IM8 Raster graphic (Sun Microsystems) 
ima Generic disk image 
IMA Image (WinImage) 
IMA Vector graphic (EGO,Chart) 
ima4 Apple QuickTime IMA4 encoded audio file 
imc game sound similar to wav file format 
imd ImageDisk disk image 
imf Apogee IMF audio file format 
IMF MIDI music file (Corridor 7, Blake Stone, Wolfenstein 3D, Spear of Destiny) 
imf Tacx Fortius file format 
IMG Bitmap graphic (Ventura Publisher) 
img CloneCD image file 
img Floppy Image image file 
img Google Android boot image file 
img Grand Theft Auto 3 game file 
IMG Image (GEM) 
IMP Spreadsheet (Lotus Improv) 
imp Urban Chaos game file 
IMQ Image presentation (ImageQ) 
IMR Cognos Impromptu report 
IMS Create executable library data (IconForge) 
ims Music file 
ims Rebel Assault file 
imx DaVis binary image file 
imy iMelody mobile phone ring-tone format 
imz Floppy Image compressed image file 
IN$ Installation file (HP NewWave) 
IN3 Input device driver (Harvard Graphics v3.0) 
INB Test script (Vermont High Test) 
INC Include file (Assembler language or Active Server) 
IND Index (dBase IV) 
IND Shared Database file (Specifically in Microsoft Windows) 
ind Well of Souls game file  
INDD Adobe InDesign document 
inf Adobe Type Manager font information 
inf Autostart CDROM file 
INF Information file (Generic) 
INF Install script (Generic) 
INF Type I LaserJet font information file 
inf Windows installation script 
INI Bank setup file (Gravis UltraSound) 
ini Gravis Ultra Sound UltraSnd.ini bank setup file 
ini IBM MWave DSP synthesizer bank setup file (mwsynth.ini) 
INI Initialization file (Generic) 
ini QuickBooks configuration file 
INI Setup file (MWave DSP synth's mwsynth.ini GM) 
ini Text configuration file 
INK Pantone reference fills file (CorelDRAW) 
INL Inline function file (Microsoft Visual C++) 
INP Source code for form, (Oracle,version 3.0 and earlier) 
INRS INRS-Telecommunications audio 
inrs INRS-Telecommunications audio file 
ins AdLib instrument file 
INS Datafile (WordPerfect for Windows) 
ins Ensoniq EPS Family instrument file 
INS Inspiration file 
INS Install script (InstallShield) 
INS Installation script (1st Reader) 
INS Instrument file (Ensoniq EPS Family) 
INS Instrument music file (Adlib) 
ins Microsoft Windows Internet Naming Service 
ins REAKTOR instrument file 
INS Sample (Cell/II MAC/PC instruments) 
ins Sample Cell instruments 
INS Sign-up file (X-Internet) 
int Devastation language file 
INT Interfaced units (Borland) 
INT Intermediate executable code (Produced when a source program is syntax-checked) 
int Unreal Tournament mutator file 
intr Assassins's Creed game file 
inuse Text configuration file (in use) 
inv Lineage inventory file 
inv Rainbow Six Rogue Spear inventory file 
INX Index file (Foxbase) 
IO Compressed archive (CPIO) 
IOB 3D graphics database (TDDD format) 
IOC Organizational chart (Instant ORGcharting!) 
IOF Findit document (Microsoft Findit) 
ion 4DOS description file 
ION File description (4dos descript.ion) 
ipf Grand Theft Auto III animation data 
ipg iPod game package file 
ipl Grand Theft Auto III object placement data 
IPL Pantone Spot reference pallette (CorelDRAW) 
IPS International patching system binary patch file 
IQY Internet inquiry (Microsoft) 
IRS Resource file (WordPerfect for Windows) 
is InStereo audio file 
ISD Spell checker dictionary (RapidFile) 
ISH Compressed archive (ISH) 
ism SimulationX encrypted model 
iso CD/DVD ISO binary image file 
iso Easy CD Creator disc image 
ISO ISO (International Standards Organization table, aka
ISO Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard 
iso LoseThos CD-ROM image 
iso Microsoft Virtual PC virtual CD-ROM image 
iso Sega CD game file 
iso Sony Playstation game image 
ISP Sign-up file(X-Internet) 
iss The Longest Journey sound file 
ist Digitrakker instrument file 
IST Instrument file (Digitaltracker) 
ISU Uninstall script (InstallShield) 
isz Compressed disk image file format 
isz WinMount compressed ISO image 
it Impulse Tracker music module 
IT Music module (MOD) (Impulse Tracker) 
IT Settings file (intalk) 
it Sound file 
ITF Interface file (JPI Pascal TopSpeed) 
iti Impulse Tracker instrument 
ITI Instrument file (Impulse Tracker) 
itl iTunes music database file 
itm Diablo II item file 
itm Infinity game engine inventory object 
itp BioWare Aurora game engine palette file  
its Impulse Tracker sample file 
ITS Internet document set (possibly a Microsoft file) 
ITS Sample file (Impulse Tracker) 
itx ISB RAW song format  
IV Open Inventor file 
IVD Microdata dimension or variable-level file (Beyond 20/20) 
IVP User subset profile (Beyond 20/20) 
IVT Table or aggregate data (Beyond 20/20) 
IVX Microdata directory (Beyond 20/20) 
IW Presentation flowchart (IconAuthor-HSC Interactive) 
IW Screensaver (Idlewild) 
IWA Text file (IBM Writing Assistant) 
IWC Install Watch document 
iwd Call of Duty file 
iwi Call of Duty skin file 
IWM Start file (IconAuthor) 
IWP Text file (Wang) 
IZT Binary token file (IZT) 
J62 Ricoh camera format file 
JAD Java Application Descriptor file 
jam Jam music score 
jam JamCracker audio file 
jam JamTracker module 
jam Leisure Suite Larry: Magna Cum Laude archive file 
jap FiFa World Cup game data fe art legalscr file 
JAR Java ARchive (a compressed file containing a package of Java application-related files) 
JAS Graphic (Generic) 
JAVA Source code (Java) 
jbc BestCrypt file 
JBD Datafile (SigmaScan) 
JBF Image browser file (Paint Shop Pro) 
JBX Project file (Project Scheduler 4.0) 
JCP Java Community Process file 
JCW Java Callable Wrapper file 
JDF Job Description File (proposed XML-based standard for end-to-end job ticket specification) 
JFF JPEG image 
JFIF JPEG image 
JIF JPEG image 
jig GameHouse Puzzle Jigsaw game file 
jig Living Scenes jigsaw puzzles 
JMG Laservision projection graphics file 
JMP Discovery chart-to-statistics (SAS JMP) 
JN1 Jill of the Jungle data (Epic MegaGames) 
JNB Workbook file (Sigma Plot 5) 
JNT Microsoft Windows Journal notes 
jo JesperOlsen audio file 
JOB Vector graphics file created by conversion of a IMG file (QuestVision) 
JOR Journal (Microsoft SQL Server) 
JOU Journal backup (VAX Edt editor) 
JPC Graphic (Japan PIC) 
JPE JPEG image 
JPEG JPEG compressed bitmap 
jpegenx Egis encrypted JPEG file  
JPG JPEG bitmap 
JPG2 JPEG 2000 image (bitmap) file 
jpgenx Egis encrypted JPG file  
jps Jigsaw Puzzle Player puzzle completion status 
jrl BioWare Aurora game engine journal file 
jrl Top Secret Crypto Gold top secret journal file 
JS JavaScript source code 
jsc JavaScript config file 
JSD Jet Suite document (eFAX) 
jse Fichier encoded Javascript 
jse JScript encoded script file 
JSM Freedom Scientific JAWS for Windows Script Message File 
JSM Gray Design Associates Jigsaws Galore Jigsaw File 
JSM Steamboat Software Jig ShapeMap  
JSP A HTML page containing a reference to a Java servlet 
jst Jnes saved game state file 
JTF Bitmap graphic (JPEG Tagged Interchange Format) 
JTF Fax document (Hayes JT Fax) 
JTF JPEG bitmap 
JTK Java ToolKit file (Sun Microsystems) 
JTP Windows Journal templates 
JW Text document (JustWrite) 
JWL Library (JustWrite) 
JXX C++ Header File 
JZZ Spreadsheet (Jazz) 
k25 Kurzweil 2500 sample file 
K25 Sample file (Kurzweil 2500) 
k26 Kurzweil 2600 sample file 
ka Karma engine (Unreal) asset file  
KAR MIDI file (text+MIDI) (Karaoke) 
kar MIDI Karaoke file  
KB Keyboard script (Borland C++ 4.5) 
KB Program source code (Knowledge Pro) 
KBD Keyboard mapping script (Procomm Plus, LocoScript, Signature) 
kbd Keyboard Script File Layout 
KBM Keyboard mapping script (Reflection 4.0) 
KCL Lisp source code (Kyoto Common Lisp) 
kda Nova Logic game file 
kdb Encrypted passwords database file 
KDC Image (Kodak Photo-Enhancer) 
KEX Macro (KEDIT) 
kext Kernel extension 
key Avira AntiVir Personal license key file 
key BioWare Aurora game engine resource file 
key BioWare Infinity game engine resource file 
KEY Datafile (Forecast Pro) 
key Diablo II key file 
KEY Icon toolbar (DataCAD) 
key Keyboard definition file 
KEY Keyboard Macro 
key Microsoft Windows 7 registry key 
key Nova Logic game key file 
key Security file 
KEY Security file (Such as a software registration number) 
key Sentry 2020 encryption file 
kf Game file 
kfl Microsoft Outlook 2007 file 
kfn KaraFun karaoke song file 
kft Korg T-series wave file 
KFX Image (KoFax Group 4) 
kgb Kremlin encrypt file 
kit Native Instruments Battery v1 drum-kit file 
KIZ Digital postcard (Kodak) 
KKW Contains all K-keywords in the RoboHELP Help project Index Designer not associated with 
kma Video Hoster karaoke file 
kmd Clicker module output 
KMD Knowledge model, data 
kml Emu48 Emulator keyboard configuration file 
KMP KeyMaP (Korg Trinity) 
kmp Korg Trinity keymap file 
KMS Knowledge model, shortcut 
KMV Knowledge model, visual 
KMZ Google Earth Saved Working Session file 
KOS MicroType Pro document 
koz Audiokoz music file 
koz Bell music file 
koz Sprint Music Store music file 
KPL Kids Programming Language 
KPP Toolpad (SmartPad) 
KPS Bitmap graphic (IBM KIPS) 
KQP Native Camera file (Konica) 
kr1 Kurzweil 2000 sample file 
KR1 Sample (multi-floppy) file (Kurzweil 2000) 
krn NBA 99 fonts file 
krz Kurzweil 2000 sample file 
KRZ Sample file (Kurzweil 2000) 
ksf Korg Trinity sample file 
KSF Sample File (Korg Trinity) 
KSF Stepfile format of several Pump It Up simulators 
ksm Kefrens-Sound Machine format 
ksm Ken Silverman's music format 
kvq Sega Smash Pack PC version file 
KYB Keyboard mapping (FTP) 
KYE Game data (Kye) 
L Linker directive file (WATCOM wlink) 
L Source code (Lex) 
L Source code (Lisp) 
laa LucasArts AdLib audio file format 
LAB Datafile (NCSS-SOLO) 
LAB Label file (Visual dBase) 
LAB Mailing labels (Microsoft Excel) 
laccdb Microsoft Access lock file 
lam Netscape Media Player streaming audio metafile 
lan DSJ 3 Language file 
LAN Loadable module (LAN DLL) (NetWare) 
lat Crossword Express lattice file 
LAY Clipart file (Printmaster Gold) 
LAY Word Chart layout (APPLAUSE) 
LBG Label generator data (dBase IV) 
lbi FIFA 2001 data feart legal screen file 
lbl Daqarta extended audio data 
LBL Label (Clipper 5) 
LBL Label (dBase IV) 
LBL Label (dBFast) 
LBM Bitmap (DeluxePaint) 
LBM Linear Bitmap graphics (XLib) 
LBO Compiled label (dBase IV) 
LBR Compressed archive (LU) 
LBR Display driver (Lotus 1-2-3) 
lbr Lotus 1-2-3 display driver 
LBT Labels (Microsoft FoxPro) 
LBX Labels (Microsoft FoxPro) 
lcd CDSpace disk image 
LCF Linker control file (Norton Guides compiler) 
LCH Used in a program (unknown) that monitors a network's response time 
lck Lock file (database access control) 
LCK Lockfile (Paradox) 
LCL Datafile (FTP) 
LCN Lection document (WordPerfect for Windows) 
LCS Data History file (ACT!) 
LCW Spreadsheet (Lucid 3-D) 
LD Long distance area codes file (Telix) 
LD1 Overlay file (dBase) 
LDB Lock file (Microsoft Access) 
LDF Library definition file (Geoworks Glue) 
LDIF Structured text file used for sharing information between E-Mail clients (Microsoft, Netscape 
LDL Library (Corel Paradox) 
ldo Nova Logic game loadout text file 
lds LOUDNESS sound system 
LDS LOUDNESS Sound System File 
ldw Virtual Villagers data 
LEG Legacy document 
LES System game profiles (same as REG file) (Logitec Entertainment) 
LET Broderbund CreataCard Letterhead file 
LET Genesis 2000 mortgage application file 
LET Letter (generic) 
LET Unknown photo image 
LEV Level file (NetHack 3.x) 
LEX Dictionary file (Generic) 
lex Lex or Flex file 
lf SoftwareKey license file 
LFD Data resource file (LucasArts Dark Forces) 
LFP LaserForms Plus file (Evergreen) 
LFT Laser printer font (ChiWriter) 
LFT Loft file (3-D Studios) (DOS) 
LG Logo procedure definition (LSRHS Logo) 
LGC Application log file 
LGD Application log file 
lgh Microsoft Windows Applog file 
LGO Header and footer logo (SuperFax) 
LGO Logo file (PaintBrush) 
LGO Startup logo (Microsoft Windows 3.x-9.x) 
lgs Microsoft Windows application log file 
LHA Alternate file suffix for LZH 
LHA Compressed Archive (LHA/LHARC) 
LHW Compressed Amiga archive (LHWARP) 
LIB Library file (Generic) 
LIF Compressed archive (Generic) 
lif HomeWorld Texture image format 
LIF Logical Interchange data (Hewlett-Packard) 
LIM Compressed archive (LIMIT) 
LIN Interactive music sequencing data file (Electronic Arts) 
LIN Line type file (DataCad) 
linux Linux file 
LIS Listing (VAX) 
LIS Output file produced by a Structured Query Reporting (SQR) program 
LIT eBook file for Microsoft Reader 
lit Quake coloured light data 
LIX Logos library system file 
LJ Text file (Hewlett-Packard LaseJet II printer) 
LK Database file (OpenSight-16 bit) 
LKO Linked object (Microsoft Outlook Express Junkmail file) 
LL3 Document file (LapLink III) 
LLX Exchange agent (Laplink) 
lma Netscape packetized audio (LiveAudio) 
lma P´s Logik-Manager protect file 
lmp Doom recorded demo file 
lmp Quake file  
lmx Lomax software game file  
ln UNIX lint file 
lng Crysis game file 
lng Diablo II game file 
LNK Datafile (Revelation) 
LNK Linker response file (RTLink) 
LNK Shortcut file (Microsoft Windows 9.x) 
lnk XNBC V8 Biological Neural Network Simulation Workstation link configuration file  
LNT LiveNote Transcript file 
localized MAC OS X file 
lock Lock file 
LOD Load file (Generic) 
LOG Log file (Generic) 
LOK Compressed file (FileWrangler) 
LP A document reader used for downloading mortgage closing information (DesertDocs) 
lp NASCAR Racing 2002 track configuration options 
lp4 36-Image Converter encrypted language pack 
lp7 LP7Signer digital signed file 
LPC Printer driver (TEKO) 
LPD Helix Nuts and Bolts file 
LPI Information file for laser printers (common with some scanning sofware) 
lqt Liquid Audio music file 
lrc Dance With Intensity file 
lrc Intel Video Phone language resource control file 
LRC Lyrics file used by music game emulators 
LRC Video phone file (Intel) 
lrf LineRider 2 Unbound custom-drawn in-game font 
LRF Linker response file (Microsoft C/C++) 
lrp Line Rider 2 Unbound puzzle part 
LRS Language resource file (WordPerfect for Windows) 
ls Links 98 game file 
ls Unix directory file 
lsd FIFA World Cup game data environment file 
lsd RPG Maker saved game file 
LSF Logos library system file 
lsi Audio file 
LSL Saved library (Corel Paradox) 
LSL Script library (Lotus) 
LSP AutoLISP, CommonLISP, and other LISP language files 
lsp Living Scenes jigsaw puzzles  
LSS Spreadsheet (Legato) 
LST Keyboard macro (1st Reader) 
LST List file (Generic) 
LST SAS text output 
LST Spool file (Oracle) 
lst Valve map related file 
LTM Form (Lotus Forms) 
ltx S.T.A.L.K.E.R. game file 
LU Library unit file (ThoughtWing) 
lua Homeworld generic lua file 
lua Prototype script file 
lua Warcraft 2 (Wargus/Stratagus) script file 
lug Black & White II file 
lug Fable: The Lost Chapters 
lug The Movies game file 
LVL Miner Descent/D2 Level extension (Parallax Software) 
lvp Avaya Voice Player compressed voice audio 
LWA Lightwave Scene (version 6 and up) 
LWD Text document (LotusWorks) 
lwf Nova Logic game hold sound profiles 
LWF Wavelet graphics file (Luratech) 
LWLO Layered Object file (Lightwave) 
LWO Lightwave Object (version 6 and up) 
LWOB Object file (Lightwave) 
LWP Wordpro 96/97 file (Lotus) 
LWSC Scene file (Lightwave) 
lwv Litewave audio file 
lwv Microsoft Linguistically enhanced sound file 
LWZ Linguistically enhanced sound file (Microsoft) 
lyr Crysis game file 
LYR Layer file (DataCAD) 
lzc Need for Speed game data file 
LZD Difference file for binaries (Ldiff 1.20) 
LZH Compressed archive (LH ARC) 
lzp Low and Order 3: Justice is Served game file 
LZS Compressed archive (LARC) 
LZS Data file (Skyroads) 
LZW Compressed Amiga archive (LHWARP) 
LZX Compressed archive (Generic) 
M Macro module (Brief) 
m Origin AdLib music format 
M Program file (Matlab) 
M Standard package (Mathematica) 
m11 Farallon's MacRecorder format  
M11 Text file (MASS11) 
m14 Microsoft Media Viewer file 
M1U Pocket TV (PDA) file 
M1V MPEG-related file (MIME type 'mpeg') 
m2a Apple MPEG-1,2 audio 
m2a MPEG-2 audio 
M2P Canopus MPEG-2 video file 
m2s MPEG-2 audio/video file 
M3 source code file (Modula 3) 
M3D 3D animation (Corel Motion) 
m3d Cossacks map file 
m3d EverQuest file 
M3U MPEG URL (MIME audio file) (MP3 Playlist) 
M4 M4 Preprocessor file (Unix) 
m4a MPEG-4 compressed audio file 
m4a Nero Digital audio file 
M4A Protected AAC audio file (possibly from iTunes Music Store) 
M4A Unprotected AAC audio file 
M4B MPEG-4 Audio Layer Bookmarkable File 
m4b MPEG-4 Audio Layer bookmarkable file  
m4b Myst IV: Revelation game archive 
m4p iTunes Music Store audio file 
M4P MPEG-4 Video File 
m4r Apple iPhone ringtone format 
m8 Heretic II MipMap image format 
ma Diablo II map file 
ma Homeworld Maya scene file 
ma MusicAssembler audio file 
ma2 Diablo II file 
MA3 Macro (Harvard Graphics 3.0) 
mac Daqarta extended audio data 
MAC Image (MacPaint) 
MAC Macro (Generic) 
mad Homeworld model animation data 
mad Mlat Adlib tracker file 
MAD Module (Microsoft Access) 
MAF Form (Microsoft Access) 
MAG A graphics format found in some Japanese files 
MAG MAG graphics format created by Woody Lynn (MPS Magro Paint System) 
MAGIC Configuration file (Magic Mail Monitor) 
MAI Mail (VAX) 
Mail "box" file (for example, INBOX.CCM) 
mail archive file 
maildb MSN Mail file 
MAK Makefile (Generic) 
MAK Project (Visual Basic or Microsoft C++) 
mal Connect Server configuration file 
MAM Macro (Microsoft Access) 
MAN Command module (Unix) 
MAN Manual page output (Unix) 
man Microsoft Windows 2000/XP mandatory user profile 
manifest Manifest files 
manifest Microsoft .NET Framework application manifest file 
manifest Windows Visual Stylesheet XML definition file 
map Blood game map  
map Carnivores Ice Age map file 
MAP Color pallette (Generic) 
map Command & Conquer Red Alert 3 file 
map Diablo II map file 
map DIV Games Studio map image format 
map Duke Nukem 3D map file 
MAP Format data (Micrografx Picture Publisher) 
map Half Life game level file  
MAP Linker map file 
MAP Map file (Atlas MapMaker) 
MAP Map file (Generic) 
MAP Map file used for color choices (Pro/Engineer) 
map Native Instruments Reaktor wavetable file 
MAP Network map (AccView) 
map Red Alert 2 mission file 
map Shadow Warrior map file 
map SpellForce level map 
MAP WAD game file (Duke Nukem 3D) 
mapimail Send mail file 
MAQ Query (Microsoft Access) 
MAR Assembly program (VAX Macro) 
MAR Report (Microsoft Access) 
MAS Graphics file (Lotus Freelance Smartmaster) 
MassEffectProfile Mass Effect user profile 
MassEffectSave Mass Effect saved game 
MAT Binary file (Matlab) 
mat Freelancer model textures file 
mat MATlab variables binary file 
mat Sound file  
MAT Table (Microsoft Access) 
maud Amiga MAUD sound file 
MAUD Sample format (Maud) 
MAX 3D scene (Kinetix 3D Studio Max) 
MAX Document (Paperport) 
MAX Layout file (OrCad) 
MAX Source code (MAX) 
MAZ A format use by Division's dVS/dVISE 
MAZ Maze data file (Hover) 
MB Memo field values for database (Paradox) 
MB1 Data file (Apogee Monster Bash) 
mbg Mailbag Assistant e-mail archive  
mbg Microsoft Mail mailbag file 
MBK Multiple index archive (dBase IV) 
MBOX Mailbox file (Berkeley Unix) 
mbr AS/400 physical file member 
mbs Multi-Purpose Internet Mail Extensions file 
mbs Opera mailbox file 
mbx Eudora mailbox file 
MBX Extension Microsoft Outlook adds to saved email, Eudora mailboxes 
mbx MBX Unix mail folder  
mbx PocoMail mailbox file 
MCC Calling card (Dialer10) 
MCC Configuration file (MathCad) 
mcc Mathcad configuration file 
MCD Document (MathCad) 
mcd MediaCD configuration file 
MCF Font file (MathCad) 
MCF Magic control file 
mcf MAX II configuration file 
mcf Media Container Format 
mcf Public Browser platform configuration file 
MCI Command script (Media Control Interface) 
MCP Application script (Capsule) 
MCP Printer driver (MathCad) 
MCP Project file (Metrowerks CodeWarrior) 
MCR Keyboard macro file (DataCad) 
mct Musicator MIDI file 
MCW Document (Microsoft Word for Macintosh) 
MCW Text document (MacWrite II) 
MD Compressed archive (MDCD) 
md1 GEAR image file 
md2 Quake 2 model file 
MDA Add-in file (Microsoft Access) 
MDA Workgroup (Microsoft Access version 2) 
MDB Database (Microsoft Access) 
MDE MDE file (Microsoft Access) 
MDF Adobe Output Designer and Central Pro Server Compiled Forms Definition 
mdf Alcohol 120% disc image 
mdf Star Trek Armada game file 
MDI Borland Multiple Document Interface file 
MDI Microsoft Digital Imaging Format file 
mdi MIDI-sequention sound 
MDI MIDIsequention Sound file 
MDI Office Document Imaging file 
mdl ASTi model builder file 
mdl DigitalTracker/DigiTrakker music module file 
mdl Flight Simulator 3D model file 
mdl Half-Life Model image format 
MDL Model (3D Design Plus) 
MDL Model file (Quake) 
MDL Model file element (Rational Rose) 
MDL Music module (MOD) (Digital Trakker) 
mdl Quake model file  
MDL Spreadsheet (CA-Compete!) 
mdl Steam Source SDK model content file 
MDM Modem definition (Telix) 
mdmp Microsoft Windows minidump file 
MDN Blank database template (Microsoft Access) 
mds Image file (media descriptor file) 
MDT Add-in file (Data) (Microsoft Access) 
MDT Data table (Microsoft ILink incremental linker) 
mdt Digital sheet music (RIFF) 
mdt Nova Logic game bump map file 
mdw Microsoft Access workgroup information file 
MDW Workgroup (Microsoft Access) 
mdx MidiEx MIDI System exclusive dump 
MDX Multiple index file (dBase IV) 
mdz Protracker module file  
MDZ Wizard template (Microsoft Access) 
ME ASCII text document (Generic) 
me Configuration file (Multi-Edit) 
MEB Macro editor bottom overflow library (WordPerfect for Windows) 
MED Macro editor delete save file (WordPerfect for Windows) 
med Music Editor, OctaMED music module (MOD) file 
MED Music module (MOD) (OctaMed Music Editor) 
mef MAIET encrypted file system 
MEM Macro editor macro (WordPerfect for Windows) 
MEM Memory variable save file (Clipper) 
MEM Memory variable save file (dBase IV) 
MEM Memory variable save file (Microsoft FoxPro) 
MEQ Macro editor print queue file (WordPerfect for Windows Library) 
MER Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and 
MER Macro editor resident area (WordPerfect for Windows Library) 
MES Macro editor workspace file (WordPerfect for Windows) 
MES Message file (Generic) 
message (Microsoft Exchange Server v 5.0)  
MET Document file (OmniPage Pro) 
met Hydrologic Modeling System (HEC-HMS) metereologic model configuration 
MET Macro editor top overflow file (WordPerfect for Windows Library) 
MET Presentation Manager metafile 
MEU Menu group (DOS Shell) 
MEX Executable command (Matlab) 
MEX Macro editor expound file (WordPerfect for Windows) 
MF Metafont text file 
mf MoonFish track file  
MFG Manufacturing file (Pro/ENGINEER) 
mfk Mafuka audio file 
mfl Microsoft Windows XP System32 WBEM file 
mfs MetFS encrypted FUSE based filesystem file 
mft NTFS master file table file 
mg EarAche audio file 
MGF A file in a Materials and Geometry Format 
MGF Font file (MicroGrafx) 
mgl Age of Empires II Age of Kings game file 
mgx Rise of Nations saved game file 
mgz Metal Gear Solid game archive  
mhd Fallout 3 file 
MHP Microsoft Home Publishing file 
MHT MHTML document (Microsoft) 
mht Mime HTML (MHTML) file 
mhtenx Egis encrypted HTM file  
MHTM MHTML document (MIME) 
MHTML MHTML document (MIME) 
mhtmlenx Egis encrypted MHTML file  
MI Data file (Cocreate ME10) 
MI Miscellaneous file (Generic) 
MIC Image Composer file (Microsoft) 
MID MIDI music 
mid MIDI-sequention sound 
midi MIDI-sequention sound 
MIF Interchange format (Adobe FramMaker) 
mif MIDI instrument file 
MIFF Machine Independent File (Generic) 
MII Datafile (MicroStat-II) 
MIM A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format
mim Multi-Purpose Internet Mail Extensions file  
MIME See MIM. 
mis Delta Force Land Warrior mission file 
mis Mission file 
mis Tom Clancey's Ghost Recon mission file 
mis Tribes 2 game file 
mix Command & Conquer game file 
mix Microsoft Windows sound MIX 
MIX Object file (Power C) 
MIX Package file (Command and Conquer) 
MIX Picture file (Microsoft PhotoDraw 2000) 
MIX Picture file (Microsoft Picture-It!) 
MIX Resource archive (Westwood Studios) 
MJF Audio file similar to MP3 (Mjuice) (Opens with WinAmp) 
mjf Mjuice MP3 audio file 
MK Makefile (Generic) 
mka Matroska audio file 
MKE Makefile (Microsoft Windows SDK) 
mkext Mac OS X Mach kernel extension memory cache 
MKI Graphic Image (MagView 5.0) (Japanese) 
mkII Mark2 SoundSystem audio file 
mkj MKJamz file 
MKP Autodesk Visual Lisp IDE Markup file 
MKP Autodesk Visual Lisp IDE Markup file 
MKS Datafile (TACT) 
ml MusicLineEditor audio file 
ML3 Project file (Milestones 3.x) 
MLB Macro library (Symphony) 
mlb Microsoft Windows Mobile media library file 
mld i-Melody format for i-Mode  
mld Polyphonic ringtone file for phones 
MLI A file in 3D Studio's Material-Library format 
MLID Muliple link interface driver file (Generic) 
MLM Groupwise email file (Novell Groupwise) 
mlp Meridian lossless packing audio file 
mls Miles Sound Tools compressed DLS format 
MM Text file (MultiMate Advantage II) 
mm3 Mortgage Minder saved mortgage configuration file 
mm4 Mortgage Minder saved mortgage configuration file 
mm4 MusicMaker V8 audio file 
mm8 MusicMaker V8 audio file 
MMAP MindManager Brainstorm and Process Control Map 
MMC Catalog file (Microsoft Clip Gallery 5.x) 
mmd Modular sound file 
MME A multipart file in the Multi-Purpose Internet Mail Extensions (MIME) format
mme Mime encoded 
MMF Mail file (Microsoft) 
mmf McAfee VirusScan configuration file 
MMF Meal Master Format, a recipe catologing format 
mmf Synthetic music mobile application format 
MMG Beyond 20/20 table or aggregate data file 
mml Aleph One Marathon Markup Language 
MML Bulk mail file (Created by MyMailList) 
MMM Multimedia movie (MacroMind Director 3.x) 
MMM Multimedia movie (Microsoft) 
MMO Memo Writer file (RapidFile) 
mmp Grand Theft Auto multiplayer map file 
MMP MindManager file (MindMapor) 
mmp MixMeister Studio playlist 
MMP Output video (Bravado) 
mms Miles Sound Tools file 
mn2 Descent 2 mission file 
MN2 Mission file (Descent2) 
mn3 Descent 3 mission file 
MN3 Mission file (Descent3) 
MND Mandelbrot for Windows 
MND Menu source (AutoCAD Menu Compiler) 
MNG Map (DeLorme Map'n'Go) 
MNG Multi-image Network Graphics 
MNI Mandelbrot for Windows 
MNT Menu file (Microsoft FoxPro) 
MNU Advanced macro (HP NewWave) 
MNU Interact menu (Intertal Systems) 
MNU Menu (AutoCAD Menu Compiler) 
MNU Menu (Norton Commander) 
MNU Menu file (Visual dBase) 
mnu MS-DOS mouse menu file 
mnu Nova Logic game menu file 
MNX Compiled menu (AutoCAD) 
MNX Menu (Microsoft FoxPro) 
MNY Account book (Microsoft Money) 
mo3 MO3 MOD audio format 
MOB Device definition (PEN for Windows) 
mob Device definition (PEN Windows) 
mob Master of Orion 3 game archive 
mod Amiga and PC Tracker module 
MOD Amiga/PC tracker module 
mod Digital music sound clip 
mod Digital music sound clip Amiga module format 
MOD FastTracker, StarTrekker, Noise Tracker (etc.) music module file 
MOD Kernel module (Microsoft Windows 9.x) 
mod Microsoft Windows kernel module  
MOD Modula-2 source code file (Clarion Modula-2) 
mod Module 
mod MS DOS implementing support for Windows DLL's file 
MOD Spreadsheet (Microsoft Multiplan) 
mod Tracker instrument file 
MOF Windows Management Object file 
moi JVC Everio digital audio file 
mon ManiacsOfNoise audio file 
MON Monitor description (ReadMail) 
mon Monopoly Deluxe game file 
mono Monolith munged encoded file 
mopp Painkiller Overdose game file 
mos System Dos62 file 
mot Linux load instructions file 
mot Motorola JADE ringtone 
MOV Movie (AutoCAD/AutoFlix) 
MOV Movie (QuickTime for Microsoft Windows) 
MOZ Zipped (Compressed) mod file 
mp+ MPEG Plus audio file format 
mp1 MPEG Audio Stream, Layer I 
MP2 MPEG Audio Layer 2 file (MIME video file) 
mp2 Sound file (MPEG-1 Layer II Audio Stream) 
mp2a Sound file (MPEG-1 Layer II Audio Stream) 
mp3 Compressed audio, music file 
mp3 mp3HD audio file 
mp3 mp3PRO file 
MP3 MPEG Audio Layer 3 (AC3) file 
MP4A MPEG Audio Layer 4 file 
mpa E-Designer file 
mpa MPEG audio file 
MPA MPEG-related file (MIME type 'mpeg') 
mpa Palm memo file 
MPC Calendar file (Microsoft Project) 
mpc MusePack Audio file 
MPD Database file (Microsoft Project) 
MPE MPEG animation 
MPEG MPEG animation 
mpega MPEG Sound 
MPG MPEG animation 
mpg Salt Lake city game movies file 
mpga Mpeg-1 Layer3 audio stream 
mpj MP3 file 
mpk Painkiller Overdose game map file 
mpk Wolfenstein 2009 game file 
mpkg Meta package file 
MPM Mathplan Macro library (WordPerfect for Windows) 
MPP Drawing file (CAD) 
mpp Microsoft Project file  
mpp Musepack audio file 
MPP Project file (Microsoft Project) 
MPQ Blizzard game data file 
mpr Live for Speed multiple player replay 
MPR Menus (compiled) (Microsoft FoxPro) 
mpr MPEG audio stream 
mpr Westwood Studios game file 
mps Max Payne saved game file 
MPT Bitmap graphics (Multipage TIFF) 
MPV View file (Microsoft Project) 
MPX Compiled menu program (Microsoft FoxPro) 
MPX Exchange file (Microsoft Project) used for exporting data 
mpx RCA/Lyra Handheld MP3 player file 
MPZ DraCAD (Japanese) file 
MRB Multiple resolution bitmap graphics (Microsoft C/C++) 
mrf Morpheus saved game file 
mrg Merge file 
MRI MRI Scan 
mrlv Tacx Fortius file format 
MRS Macro resource file (WordPerfect for Windows) 
MSA Archive (Magic Shadow) 
msb The Bat! file 
msc AdLib MSCplay file 
MSC Common console document (Microsoft Windows 2000) 
MSC Makefile (Microsoft C) 
msc Microsoft management console control file 
MSD Diagnostics report file (Microsoft MSD) (Diagnostics) 
MSDL Scene Description Language (Manchester) 
msf Mozilla Thunderbird mail summary file 
MSF Network 7.0 mail file 
msg icrosoft Office Outlook message format 
MSG Mail message (Microsoft) 
msg Microsoft Exchange mail document 
msg PMMail 2000 e-mail message file 
msg PMMail/2 e-mail message file 
MSI Installer package (Microsoft Windows) 
MSN Mission File (Descent) 
MSN Network document (Microsoft) 
mso ActiveMime object file 
mso MedlySound module 
mso Word OLE web page storage stream 
MSP Paint bitmap (Microsoft) 
msp Windows Installer patch file 
MSP Windows Installer patch file 
MSS Manuscript text file (Jove) 
MSS Manuscript text file (MINCE) 
MSS Manuscript text file (Perfect Writer) 
MSS Manuscript text file (Scribble) 
mss Miles Sound System DLS 1 sound format 
msstyles WIN Resources Themes Luna file 
MST Minispecification file (Prosa) 
MST Setup script (Microsoft SDK) 
MST Windows Installer transform 
MSV Sony Memory Stick Compressed Voice File; requires Sony plug-in for Windows Media Player 
msv Sony Memory Stick compressed voice files 
MSW Text file (Microsoft Word) 
MSX Compressed CP/M archive (MSX) 
mt2 MadTracker 2 module file 
mt9 Music 2.0 song file 
mtd Digital sheet music file 
mtd Microsoft Live Mesh hash file 
mtf Darkstone game archive  
MTH Math file (Derive) 
mti MadTracker 2 instrument file 
mtk MPU-401 Trakker file 
mtm MultiTracker music module (MOD) file 
MTM Music module (MOD) (Multitracker) 
mts MadTracker sample file  
mtv MTV Music Generator game file 
MTW Datafile (Minitab) 
MTX Twain device driver (32 bit)(UMax) 
MU Menu (Quattro Pro) 
mui Amiga MUI default class/library 
mui MultiLanguage Windows resource file 
MUL Online game called Ultima online 
MultiModule screensaver 
mus Doom music file 
mus Doom music file 
mus Harmony Assistant music file 
mus Infinity game engine music control file 
MUS Interactive music audio data file (Electronic Arts) 
MUS Music (Generic) 
MUS Music (MusicTime) 
mus Music file format 
mus Musifile MPEG Layer II audio stream 
mus SCORE Music publishing system music notation 
MUS10 Audio (Mus10) 
mus10 Audio (Mus10) file 
MV Server-side script file (Miva) 
MVA Video accelerator file (Matrox) 
MVB Multimedia Viewer file (Microsoft) 
MVC Image file (Sony Digital Mavica) 
mve Infinity game engine file 
MVE Interplay video file (Descent2, Fallout2) 
mve Wing Commander III MVE movie file format 
MVF Stop frame file (AutoCAD-AutoFlix) 
MVI Movie command file (AutoCAD-AutoFlix) 
MVL 3D ultrasound file 
MVL Descent 2 (game) movie archive 
MVW Log file (Saber LAN) 
MWF Animation (ProMotion) 
MWP Smartmaster file (Lotus WordPro 97) 
mxc2  MAGIX Music Maker cache 
MXD Map file (ArcInfo) 
mxd MX Editor remote control device configuration file 
mxf Material Exchange Format file  
mxf Maxis SimCity font file 
MXT Datafile (Microsoft C) 
mydocs Send to file 
MYP Presentation file (Make Your Point) 
myr Harmony Assistant music file 
mys Myst saved game file 
M_U Hard Drive Boot sector backup (MazeGold) 
NAN Nanoscope files (Raw Grayscale) 
NAP Metafile (NAP) 
NAP Video file (EnerGraphics) 
NB Text file (Nota Bene) 
nba NBA game data 
nba Nota Bene configuration information file 
NC Instructions for numerical control machine (CAMS) 
NCB Developer Studio file (Microsoft) 
NCC CNC (Computer Numeric Control) file (CamView 3D) 
NCD Change directory (Norton) 
ncd NTI CD-Maker disk image  
NCF Command File (Netware) 
NCF Internal clipboard (Lotus Notes) 
ncf Novell NetWare configuration 
ncf Steam game configuration file 
ncf Steam game configuration file 
ncf Systems Management Server (SMS) network configuration file 
nch On Hold message or music file  
NCH Outlook Express folder file 
NCO Nero BackItUp compressed backup file 
ncs Star Wars: Knights of the Old Republic compiled script 
nd QuickBooks network data file 
nda Nero BackItUp drive image 
NDB NetOp database (Danware Data) 
NDB Network database (Intellicom) 
NDO 3D low-polygon modeler (Nendo) 
nds Indiana Jones and the Infernal Machine saved game 
NDX Database file (1ACT! for Microsoft Windows) 
NDX Index file (Cindex) 
NDX Index file (dBase II-III-IV) 
nec PIMS Notes for Windows CE audio record file 
NEO Raster graphics (Atari Neochrome) 
NES Emulator ROMS for game console (Nintendo) 
net Defines host configuration for network interfaces, host name, default gateway, and static routes 
NET Netlist output file (Orcad Schematic Capture) 
NET Network configuration file 
netCDF Network Common Data Form 
netsh Netsh
NEW New info 
nex Nexcon system file 
NEZ Emulator file used for game consoles (NES) 
NFF Neutral File Format 
NFO Info file database text 
NFO Infobase file (Folio) 
NFT Template file (Netobject Fusion) 
NG Online documentation database (Norton Guide) 
ngh Neighbours from Hell 2 saved game file 
nib Adobe AIR file 
nib Disk image file 
nib Interface Builder user interface resources 
niff Notation Interchange File Format 
NIL Icon Library file (EasyIcons-compatible) (Norton) 
nip Microsoft DRM (Digital Right Management) file 
NIST Audio (NIST Sphere) 
nist Audio file  
nki Native Instruments instruments file 
NLB Data (Oracle 7) 
NLM Loadable Module (Netware) 
nlm Novell Netware loadable module 
NLO NetG Skill Builder file 
nls National Language Support File (font or font map) 
NLS National Language Support file used for localization (for example, by Uniscape) 
NLU E-Mail Trigger file (Norton LiveUpdate) 
NLX Form (FormWorx 3.0) 
nob Silver game data and sprites  
nob Vampire: The Masquerade game archive 
NOD File (Netobject Fusion) 
nor ATI Radeon driver file 
NP Project schedule (Nokia Planner) 
NP Project schedule (Visual Planner 3.x) 
npf Nero SoundTrax project file 
npg Die Hard Nakatomi Plaza saved game 
npg NextPlay game data 
NPI Source for interpreter (dBase Application Generator) 
npj Nova Logic game mission file 
npl Core Media Player Nefertiti playlist 
npl Nokia audio file 
NRF Data file (NICOLET) 
NRG Image file (Nero) 
nrg Nero-Burning ROM CD or DVD image file 
NRI iManage file 
NRL iManage infoRite document hyperlinks 
NRL Template (Microsoft Outlook) 
nrv Nero Video-CD compilation. 
NS2 Database (Lotus Notes version 2) 
NS3 Database (Lotus Notes version 3) 
NS4 Database (Lotus Notes version 4) 
NSF Database (Lotus Notes) 
nsf NES sound file 
NSO Document file (NetObject Fusion) 
nsp Computerized Speech Lab audio speech format 
nsp Multi-Speech sound file 
NST Music module (MOD) (Noise Tracker) 
nst NoiseTracker music module 
nst Nokia Star Torrent system file 
nsu NVIDIA nTune Command system profile settings 
NSV Nullsoft streaming video file that comes with Winamp 
nsv Winamp video file 
NT Startup files (Microsoft Windows NT) 
NTF Database template (Lotus Notes) 
nti Disk image related file 
NTR Executable ASCII text file 
NTS Executable ASCII text file 
NTS Tutorial (Norton) 
NTX Index file (CA-Clipper) 
ntx yEnc32 encoded file 
NUF Message for new users (1st call) (Procomm Plus) 
nut Lucas Arts animation 
nut Star Fox: Assault texture file 
nvf Creative Labs Nomad voice file 
nwc Noteworthy Composer song file 
NWC Song file (Noteworthy Composer) 
nwf Nero WaveEditor file 
nwp Noteworthy Player file type 
nws Internet News Message 
NWS News message (MIME RFC822) (Microsoft Outlook Express) 
NXT Sound file (NeXT) 
O Object file (Atari) 
O Object file (GCC) 
O Object file (Unix) 
O$$ Outfile (Sprint) 
o01 Typhoon voice file 
OAS Word processor document (Fujitsu OAS)(Japanese) 
OAZ Fax (NetFax Manager) 
OB Object cut/paste file (IBM LinkWay) 
OBD Binder (Microsoft Office) 
OBD Binder template (Microsoft Office) 
obi Microsoft Outlook 2007 file 
OBJ Object file 
obk UbiSoft ChessMaster opening book file 
OBR Object browser data file (Borland C++) 
OBS Script (ObjectScript) 
OBV Visual interface (ObjectScript) 
OBZ Binder Wizard (Microsoft Office) 
OCF Object craft file (Object Craft) 
OCR Transcribed fax-to-text file (FAXGrabber) 
ocx ActiveX control file 
OCX OLE custom control 
ODC OpenDocument Chart 
odf BattleZone cartographers guild file  
odf Star Trek Armada ship, structure information  
ODG OpenDocument Graphic 
ODI OpenDocument Image  
ODIF OpenDocument Chart Template/td> 
ODIF OpenDocument Interchange Format 
ODL Type library source (Visual C++) 
ODP OpenDocument Presentation file 
ODS Mailbox file (Microsoft Outlook Express) 
ODS OpenDocument Spreadsheet 
ODT OpenDocument Text file 
OFD Form definition (ObjectView) 
OFF Object File (3D Mesh) 
OFN FileNew file (Microsoft Office) 
ofr OptimFROG encoded audio 
ofs OptimFROG dualstream file 
oft Microsoft Outlook template file 
OFT Template (Microsoft Outlook) 
oga Ogg Vorbis audio profile 
ogg Ogg Vorbis audio file 
OGG Ogg Vorbis audio file 
ogg Salt Lake city game file 
OGM Ogg Media video file 
OKR Feldeinteilung module file (3-D Fassade Plus) 
OKT Music module (MOD) (Oktalyzer) 
okt Oktalyzer music module (MOD) file 
OLB Object Library (OLE) (Microsoft) 
OLB Object library (VAX) 
OLD Backup file (Generic) 
OLE Object Linking and Embedding (OLE) custom control (Microsoft) 
OLI Text file (Olivetti) 
olv OnLive! Traveler sound file 
oma Sony OpenMG music format file 
OMC Atrac3 (Sony Music Store) audio file 
OMF Open Media Format File 
one Microsoft OneNote section file 
onepkg Microsoft OneNote package file 
OO1 Voice file (Typhoon) 
OOGL Object Oriented Graphics Library 
OOM Swap file (Shroom) 
opf KEPServerEX project configuration file 
OPJ Project file (Orcad Schematic Capture) 
OPL Organiser Programming Language source file (Psion/Symbian) 
OPN Active options (Exact) 
OPO Output executable file (OPL) 
OPT Developer Studio file (Microsoft) 
OPT Optimize support file (QEMM) 
OPW Organization chart (Org Plus for Windows) 
OPX Extension DLL (OPL) 
OPX Inactive options (Exact) 
OPX Microsoft Organizer Organization Chart 
opx OPL extension DLL 
OR2 Calendar file (Lotus Organizer 2) 
OR3 Lotus Organizer 97 file 
ORA Configuration file (Oracle 7) 
ORA Parameter file (Oracle) 
orc CSound orchestra midi file 
orc Digital Orchestrator Plus sound file 
ORC Script (Oracle 7) 
orf Descent 3 Outrage room format 
ORG Calendar file (Lotus Organizer) 
org Yamaha organ flutes 
osd Directory Opus configuration file 
osf Descent 3 sound file 
osf ICZ OriSAFE file 
osp Orion Sampler file 
OSS Search file (Microsoft Office) 
ost Microsoft Outlook/Inbox offline folder 
OST Offline file (Microsoft Exchange/Outlook) 
OTG OpenDocument Graphic Template 
oth Microsoft PowerToys Explorer tool 
others 
OTI OpenDocument Image Template 
OTL Outline font description (Z-Soft Type Foundry) 
OTL Template file (PrintMaster Gold) 
OTL Template file (Super NoteTab) (Fookes) 
otp Top Secret Crypto Gold one time pad key file 
ots OtsJuke sound file 
ots Yamaha PSR-9000 file 
ott Nokia phone ring tone 
OTT OpenDocument Text Template 
OTX Text file (Olivetti Olitext Plus) 
OUT Output file (Microsoft C) 
out Roland S-5xx series floppy image 
out Roland S-7xx series floppy image 
OV Database file (Revelation-DOS) 
OV1 Overlay file  
OV2 Overlay file 
ov2 Overlay file 
ova Open Virtual Machine Format 
OVD Datafile (ObjectVision) 
ovf Open Virtualization Format 
OVL Overlay file 
ovl Overlay file 
ovpn OpenVPN config file  
OVR Overlay file 
p AKAI S1000/S1100/S01 program file  
p AKAI S3000/S3200/S2000/S2800 program file  
p AKAI S900/S950 program file 
P Application parameter file (ReaGeniX code generator) 
P Picture file (APPLAUSE) 
P Source code (Pascal) 
p01 GEAR image file 
P10 Plot 10 drawing (Tektronics) 
p12 PFX file (Personal Information Exchange) 
P16 16 Channel Music file (ProTracker 16) 
P22 Patch file (Patch 22) 
P3 Project Planner file (Primavera) 
p3d Operation Flashpoint game model 
p3d Prototype game file 
P65 Document file (PageMaker 6.0) 
p7 Elemica eSignature application  
p7b SPC file - cryptographic certificate 
P7C Digital ID file (MIME) 
p7m PKCS #7 MIME Message 
PA Print Artist Project file 
PA1 Worktable (PageAhead) 
PAB Personal Address Book (Microsoft) 
pac Desperados game archive 
PAC Image (Stad) 
pac LPAC lossless compressed audio 
PAC Package file (Sound Blaster Studio II) 
pac Pacman file 
pac SB Studio II package file 
PAD Keypad definition (Telemate) 
paf Ensoniq PARIS audio format 
PAF Personal Ancestry File (free genealogy software from the Mormon Church) 
pak Blitzkrieg archive file 
pak Brothers Pilots 4 game file 
pak Call of Juarez archive 
pak Call of Juarez game package file 
PAK Compressed archive (PAK) 
pak Computer games pack file 
pak Dreamfall: The Longest Journey game file 
pak Dune 2 archive file 
pak Far Cry game archive 
pak Final Fantasy VIII archive 
pak Lands of Lore archive 
pak Legend of Kyrandia 2: Hand of Fate archive 
pak LucasArts The Secret of Monkey Island: Special Edition game data file 
pak Maximus XV game archive 
pak Quake I pack file 
pak TrickStyle archive 
PAK WAD file (Quake) 
pak Zanzarah game file 
PAL A compressed file (Generic) 
PAL Color palette (Microsoft) 
pal Command & Conquer file 
pal Rise of Nations campaign media file 
PAN Printer specific file (CorelDRAW) 
PAQ Password encrypted zip file (Hewlett-Packard) 
par AeroFly model parameters 
par FMS flight characteristics file 
PAR Parameter file (Fractint) 
PAR Parts application (Digitalk PARTS) 
PAR Permanent output file (Microsoft Windows 3.x) 
par Windows 3.x swap file 
PART eDonkey partial download 
PART eMule partial download 
PART Go!Zilla partial download 
part1 NetObjects Fusion system file 
PAS Source code file (Borland Pascal) 
pat Black and White 2 Paths Data File 
PAT exePatch utility used for Warcraft2 (WarHack) 
pat Gravis Ultrasound Forte Technologies Patch file  
PAT Hatch pattern file (DataCAD) 
pat Kega Fusion Game Cheat File 
pat Palace Server Rooms Configuration File 
PAT Patch file (Advanced Gravis Ultrasound/Forte Technologies) 
PAT Pattern file (CorelDRAW) 
pat Train Simulator Track Path File 
pat WarHack Warcraft 2 utility file 
payload Microsoft Windows Mobile file 
PB Fax (FAXability Plus) 
PB Phone book (WinFax Pro) 
PB Setup file (PixBase) 
PB1 Document (First Publisher for Windows) 
PBA Source code file (Powerbasic BASIC) (Genus) 
PBD Dynamic library, an alternative to a native DLL (PowerBuilder) 
PBD Phone book (FaxNOW!-Faxit) 
pbd PowerBuilder dynamic link library 
pbf Grand Prix Legends BMAP (Bitmap) file 
pbf Turtle Beach Pinnacle bank file 
PBF Turtle Beach Pinnacle Bank File 
PBI Include file (PowerBasic) (Genus) 
PBI Profiler binary input file (Microsoft Source Profiler) 
PBK Microsoft Phonebook 
PBL Library file used in a development environment (PowerBuilder) 
PBL PowerBasic library (Genus) 
PBM Planar bitmap graphic (XLib) 
PBM Portable bitmap graphic 
PBN Portable Bridge Notation file 
pbo Operation Flashpoint game mission folder 
PBO Profiler binary output (Microsoft Source Profiler) 
PBR Resource file (PowerBuilder) 
PBT Profiler binary table (Microsoft Source Profiler) 
PC Text file (IBM) 
pc2 Autodesk AutoCAD R14 plotter configuration file 
pc2 PrivateChat! file 
pc3 Autodesk AutoCAD R2000 plotter configuration 
PC3 Custom palette (Harvard Graphics 3.0) 
PC8 Ascii text IBM8 character set (NewWave Write) 
PCB Application data file (Microsoft Powerpoint) 
PCC Cutout picture vector graphics (PC Paintbrush) 
pcd Corel Adaptec CD Creator image file 
PCD Image (Kodak Photo-CD) 
PCD P-Code compiled test scripts as in Microsoft Test and Microsoft Visual Test 
PCE Maps Eudora mailbox names to DOS filenames 
pcf Cisco VPN Client configuration file 
pcf Microsoft Source Profiler profiler command file 
pcf Packaged collaboration files 
pcf PowerToy Calculator saved functions and variables 
PCF Profiler command file (Microsoft Source Profiler) 
pcf Systems Management Server (SMS) patron configuration file 
pcg Korg Triton bank file 
PCH Patch file (Generic) 
PCH Precompiled header file (Microsoft C/C++) 
pch2 Nord Modular G2 patch 
PCI PCI Miniport file (Microsoft Windows System file) 
PCJ Multimedia authoring tool graphics (IBM Linkaway-Live) 
pck Commandos 2 game file  
pck Commandos 3 game file 
PCK Pickfile (Turbo Pascal) 
PCL Printer Control Language file (printer-ready bitmap) (Hewlett-Packard) 
PCM Audio file 
pcm Generic audio file  
pcm LaserJet Printer Cartridge Metric for printer driver 
pcm OKI MSM6376 synth chip PCM audio format 
PCM PCM file (OKI MSM6376 Sythesizer Chip) 
PCP Live Update Pro file (Symantec) 
PCS Animation (PICS) 
PCS Picture storage file (Microsoft) 
PCT PICT drawing (Macintosh) 
PCW Text file (PC Write) 
PCX PC Paintbrush bitmap (ZSoft) 
PDA Bitmap graphics 
PDB Brookhaven Protein Database file 
PDB Data file (TACT) 
PDB Database file (3Com PalmPilot) 
PDB Physical model backup file (PowerDesigner) 
PDD Graphic image that can be opened with Paint Shop Pro and Adobe PhotoDeluxe 
pde Encrypted file 
PDF Definition File 
PDF Graphics file (ED-SCAN 24bit) 
PDF Portable Document file (Adobe Acrobat) (displayable with a Web browser) 
pdf Print device information (Netware) 
PDF Printer Definition File (Netware) 
pdf Printer description (QuarkXpress) 
pdfenx Egis encrypted PDF file  
pdi Instant Copy disk image 
PDL Project description language file (Borland C/C++) 
PDM Physical model file (PowerDesigner) 
pdn Dam file 
PDP Print Shop Deluxe file (Broderbund) 
PDQ Flowcharting PDQ Lite file (Patton and Patton) 
pdr Windows Port Driver, Device Driver 
PDS Broderbund Print Shop Deluxe 
PDS Hardware assembly source code file (Pldasm) 
PDS NASA Planetary Data System Format Space Mission Data 
PDS Photographic image file (origin not yet identified) 
PDS PLDASM Source Code 
PDS Print Shop Graphic 
PDT Database file (ProCite) 
PDV Printer driver (Paintbrush) 
PDW Document (Professional Draw) 
PDX Active Sensing PDXplorer IPC-2570 Product Data Exchange Information File 
PDX Adobe Acrobat Catalog Index  
PDX Adobe Acrobat Catalog Index  
PDX Database index file (ProCite) 
PE3 Image archive file (QuickViewer) 
PE3 Image archive file (Ulead PhotoImpact) 
PE4 Image archive file (Ulead PhotoImpact v.4.0) 
PEB Program Editor bottom overflow file (WordPerfect for Windows Library) 
PED Program Editor delete save file (WordPerfect for Windows) 
peg Red Faction II game data 
pem Audio module 
pem Pidgin instant messenger certification file 
pem Privacy Enhanced Mail security certificate 
PEM Program Editor macro (WordPerfect for Windows library) 
PEQ Program Editor print queue file (WordPerfect for Windows) 
PER Program Editor resident area file (WordPerfect for Windows Library) 
PES Program Editor work space file (WordPerfect for Windows Library) 
PET Program Editor top overflow file (WordPerfect for Windows Library) 
pf Aladdin Systems private file 
PF Encrypted file (Alladin Systems) 
pf Windows prefetch file 
PF Windows XP prefetch file (data read into RAM in anticipation of a user asking for it) 
PFA Type 3 font (ASCII) 
PFB Type 1 font (binary) 
PFC Personal filing cabinet file (AOL) 
PFC PF Component file 
PFC Text file (First Choice) 
PFD SoftPro Real Estate Proform Document Format 
pfd Sony PlayStation 3 saved game control data 
pff Armored Fist 3 game archive  
pff Comanche 4 game archive 
pff Delta Force game archive 
pff F22 Lightning 3 game archive 
PFF Paraform file for 3D modeling (Scandata) 
pff Tachyon game archive  
PFK Programmable function keys (XTreePro) 
PFM Printer Font Metrics (Microsoft) 
PFS Database text file (PFS
PFT Printer font (ChiWriter) 
pfx Certificate File 
pfx Personal Information Exchange 
PG Page cut/paste file (IBM LinkWay) 
PGI Printer graphics file device driver (PGRAPH Library) 
PGL Plotter drawing (Hewlett-Packard) 
pgm AKAI MPC-1000 drum set file 
pgm AKAI MPC-2000 drum set file 
pgm AKAI MPC-2000XL drum set file 
pgm AKAI MPC-3000 drum set file 
PGM Portable Graymap (bitmap) 
PGM Program file (Signature) 
pgmf Tacx Fortius file format 
pgn Portable Game Notation 
PGN Portable game notation file (ChessMaster and others) 
PGP PGP encrypted file 
pgp Pretty Good Privacy encrypted file 
PGS Manual page (man4dos) 
PH Optimized .goh file (Geoworks) 
PH Perl header file 
PH Phrase-table (Microsoft C/C++) 
PH Temporary file generated by Microsoft Help Compiler 
phd Tomb Raider game level file 
PHN Phone list (QmodemPro) 
PHN Phone list (UltraFax) 
phn Phun scene file 
PHO Phone database (Metz Phone for Windows) 
PHP HTML page that includes a PHP script 
PHP3 HTML page that includes a PHP script 
phr MRS-802 phrase audio data (Stereo Right Channel) 
PHR Phrases (LocoScript) 
PHR Zoom MRS-802 Phrase Audio Data file 
PHS PHScript File 
PHTML HTML page that includes a PHP script 
PHTML perl-parsed HTML 
PI1 Low resolution picture file (Dages Elite) 
PI2 Medium resolution picture file (Dages Elite) 
pi2 Studio2 high resolution encrypted image 
PI3 High resolution picture file (Dages Elite) 
PIC 3D Image file (SoftImage) 
PIC Bitmap (PC Paint) 
PIC PICT drawing (Macintosh) 
PIC Picture file (Lotus) 
PIC Pixar picture file (SDSC Image Tool) 
PICT PICT image file (Macintosh) 
pid Creative Driver File  
PIF Compressed archive (Macintosh) 
PIF PIF drawing (IBM) 
PIF Program Information File 
PIF Vector graphics GDF file (IBM Mainframe) 
pig Descent texture file 
pig Lucas Arts Dark Forces WAD file 
PIG WAD file (Lucas Arts Dark Forces 
PIN Data file (Epic Pinball) 
PIN Data file (Epic Pinball) 
PINS Password file of the program PINs, Passwords and Co. 
PIX Alias image file (SDSC Image Tool) 
PIX Bitmap (Inset Systems) 
piz Pizza Connection 2 saved game  
PJ Project file (CA-SuperProject) 
PJ Source Integrity file (MKS) 
PJT Visual FoxPro memo file (Microsoft) 
PJT Visual Foxpro Project (Microsoft) 
PJX Visual FoxPro project file (Microsoft) 
PK Packed bitmap font file (TeX DVI) 
pk1 XS game file 
pk2 Silkroad online game data file 
pk2 XS game file 
pk3 Quake 3 Arena game engine file 
pk3 Quake Live game file 
pk4 Doom 3 engine packed file 
PKA Compressed file archive (PKARC) 
pkg Apple MAC OS X installer file 
PKG Developer Studio application extension (similar to a DLL file) (Microsoft) 
PKG Installer script (NEXT) 
pkg Microsoft Developer Studio application extension 
pkg Midtown Madness 3D model file 
pkmdl Painkiller Overdose game file 
pkr Pretty Good Privacy public keyring 
PKR Public Keyring (PGP) 
pkr Tony Hawk's Pro Skater 2 game archive 
PKT Packet file (Fidonet) 
PL Interleaf printerleaf (or WorldView) format 
PL Palette (Harvard Graphics) 
PL Property list font metric file (TeX) 
PL Source code file (Perl) 
PL Source code file (Prolog) 
PL1 Room plan (3D Home Architect) 
PL3 Chart palette (Harvard Graphics 3.0) 
pla NHL game file 
PLB Library file (Microsoft FoxPro) 
PLC Add-in file (Lotus 1-2-3) 
pld Microsoft Messenger Plus backup configuration file 
ple Messenger Plus! encrypted log file 
ple Phone2PC sound file 
PLG A format use by REND386/AVRIL 
PLI Data description file (Oracle 7) 
PLL Pre-linked library file (Clipper 5) 
plm DisorderTracker2 module 
PLM Module (DisorderTracker2) 
plm Panasonic SD voice editor file 
pln Microsoft Flight Simulator flight plan file 
pln Microsoft Flight Simulator flight plan file 
PLN Spreadsheet (WordPerfect for Windows) 
PLR Pilot file (Descent 1-3) 
plr Player file 
pls Audio playlist file 
pls DisorderTracker2 sample 
PLS MPEG PLayList file (used by WinAmp) 
PLS MYOB Plus file 
PLS Sample file (DisorderTracker2) 
plt Bentley's CAD MicroStation plot driver configuration file 
PLT Drawing (HPGL Plotter) 
plt EPOC software platform file 
plt HP Graphics Language file (plotter) 
PLT Palette (Generic) 
PLT Plot drawing (AutoCAD) 
PLT Pre-linked transfer file (Clipper 5) 
PLT Sign-making software (Gerber Optical) 
plt X-wing vs. Tie Fighter pilot file  
PLY Data file (PopMail) 
PLY Presentation screen (Harvard Spotlight) 
pm Amiga Power music format 
pm Amiga Power Music module  
PM Bitmap graphics (Presentation Manager) 
PM Module (Perl) 
pm Rebel Assault game file 
PM3 Document (PageMaker 3.0) 
PM4 Document (PageMaker 4.0) 
PM5 Document (PageMaker 5.0) 
PM6 Document (PageMaker 6.0) 
PMC Graphics (A4TECH Scanner) 
PMD Adobe PageMaker 7.x file 
pmd Phone polyphonic ringtone file 
pmi Pegasus Mail message folder index file 
pmm Pegasus Mail mail message folder 
PMM Program file (Amaris BTX/2) 
pmp Soldat map maker file 
pmx E-mail Examiner file 
pmx Pegasus Mail outgoing message  
PN3 Printer device driver (Harvard Graphics 3.0) 
pna PhatNoise Music Manager audio file 
pnc Palm OS configuration file 
PNG Bitmap (Portable Network Graphics) 
PNG Bitmap file (MacroMedia FireWorks) 
PNG Browser catalogue (Paint Shop Pro) 
PNG PrintMaster graphics file 
PNG Spore creature file 
PNM Portable aNY Map graphics (PBM) 
PNT Graphic file (MacPaint) 
PNT Pen Table plotting file (Pro/Engineer) 
PNT QWK reader pointer file (MarkMail 2.x) 
PNTG Same as PNT file 
po Disk image file 
poa FiFa World Cup game data fe art Legalscr file 
pod Bloodrayne archive file 
pod Nocturne game archive 
pod Terminal Velocity archive 
POG PIG file extension (Descent2) 
POH Optimized .goh file (Geoworks) 
POL 3D polygonal modeling file (Innovmetric) 
pol Music file 
pol Policy Windows 95 network setup file 
POL Windows NT Policy file 
pol Windows policy file 
POP Message index (PopMail) 
POP Popup file (Visual dBase) 
POT PowerPoint template (Microsoft) 
potm PowerPoint 2007 Macro-Enabled XML template 
potx Microsoft PowerPoint 2007 XML template 
POV Persistence of Vision file (Ray-Tracer) 
POW Chord chart (PowerChords) 
PP Compressed Amiga archive (POWERPACKER) 
pp Pocket Physics saved data 
PP4 Bitmap (Picture Publisher 4) 
PPA PowerPoint Add-in (Microsoft) 
ppam PowerPoint 2007 macro-enabled XML add-in file 
PPB Button bar for print preview (WordPerfect for Windows) 
PPD PostScript Printer definition file specification (Adobe Acrobat v.4.0) 
PPF Pinnacle Program File (Turtle Beach) 
ppf Turtle Beach Pinnacle program file 
PPI Graphics file (Microsoft PowerPoint) 
ppk PuTTY Win32 Telnet/SSH client private key 
PPL PolaroidPalettePlus ColorKey device driver (Harvard Graphics 3.0) 
PPM Portable Pixelmap bitmap 
PPO Pre-processed output file (Clipper 5) 
PPP Desktop publishing default output file (Serif PagePlus) 
PPP Document or finished project (Parson Power Publisher) 
PPS ArcView Processing Set Codes 
PPS Personal Producer Storyboard 
PPS PowerPoint slide show (Microsoft) 
PPS PowerPoint Slideshow 
ppsm Microsoft PowerPoint 2007 macro-enabled XML show 
ppsx Microsoft PowerPoint 2007 XML Show 
ppsxenx Egis encrypted Powerpoint Open XML PPSX file 
PPT PowerPoint presentation (Microsoft) 
pptenx egis encrypted Powerpoint PPT file 
pptm PowerPoint 2007 Macro-Enabled XML Presentation 
pptx PowerPoint 2007 XML Presentation 
pptxenx Egis encrypted Powerpoint Open XML PPTX file  
PPX Cognos Powerplay portable report (xml format) 
PQB Master boot backup file (PowerQuest BootMagic) 
PQI Drive image file (PowerQuest) 
PR2 Presentation (Aldus Persuasion 2.x) 
PR2 Printer driver (dBase IV) 
PR3 Postscript printer driver (dBase IV) 
PR3 Presentation (Aldus Persuasion 3.x) 
prb PSpice PROBE configuration file 
PRC Resource (text or program) file (3com PalmPilot) 
PRD Printer driver (Generic) 
pre NeroWave Editor presets 
PRE Presentation (Lotus Freelance) 
PRE Settings (Microsoft C/C++) 
PRE Settings (Programmer's WorkBench) 
prefpane Mac OS X System Preference Pane 
PREL Adobe Premiere Elements Project 
prf ClarisWorks preferences file 
prf dBase IV printer driver 
prf Macromedia Director settings file 
prf MicroImages print driver file 
prf Microsoft Profiler output 
prf Microsoft Windows system file 
prf Outlook Profile File 
PRF Output file (Profiler) 
PRF Pixel Run Format graphics (Improces-Fastgraph) 
PRF Printer driver (dBase IV) 
PRF Settings file (Macromedia Director) 
PRF System file (Microsoft Windows) 
PRG Program file (WAVmaker) 
PRG Program source files (Atari) 
PRG Program source files (dBase IV, Clipper 5, and Microsoft FoxPro) 
prg WAVmaker program file 
PRI Printer definitions (LocoScript) 
PRJ Project file (3D Studio) (DOS) 
prm Hitman game file 
prm MicroImages parameters file 
PRM MYOB Premier file 
PRM Parameter file (Generic) 
prm SYNETSIM parameter file  
PRN Print Table (space delimited text) 
PRN Printer driver (Signature) 
PRN Text file (Lotus 1-2-3-Symphony) 
PRN Windows Printer file (DataCAD) 
PRND PageMaker 7.0 file 
PRO Configuration file (Pro/Engineer) 
pro Configuration file (PROfile)  
pro Creamware Pulsar audio file  
pro Euphoria profile file 
pro Graphics profile file (DOS) 
PRO Graphics profile file (DOS) 
pro Infinity game engine projectile type description file 
pro Jabbim (Jabber client) file 
pro Pegasus Mail profile file 
pro Pro/ENGINEER configuration file 
PRO Project file (Terramodel) 
pro Qt Project configuration file 
pro Sid Meier's SimGolf game file 
PRO Source code file (Prolog) 
project file 
properties HSQLDB configuration file 
PRP Data conversion saved project file (Oberon Prospero) 
prs Lode Runner game 
prs Norton Viewer DLL file 
PRS Presentation file (Harvard Graphics for Windows) 
PRS Printer resource font file (WordPerfect for Windows) 
PRS Procedure file (dBase IV) 
prs Yamaha Pro style file 
PRT A print-formatted file 
prt Dr.Halo printer driver 
PRT Part file (CADkey) 
PRT Part file (Pro/Engineer) 
PRT Printer driver (Dr. Halo) 
prt Printer driver file 
prt Printer formatted file 
PRT Unigraphics CAD file 
PRV Internet provider template file (psiMail) 
prv SecretAgent private key file 
prvkr Pretty Good Privacy private keyring file 
PRX Compiled program (Microsoft FoxPro) 
PRZ Graphics file (Lotus Freelance 97) 
ps Paul Shields song 
PS Postscript-formatted file (a Postscript printer-ready file) 
PSA Adobe Photoshop Elements Album 
psb Pinnacle sound bank file 
psb Project Scheduler configuration file  
PSB Sound Bank file (Pinnacle) 
PSD Bitmap (Adobe Photoshop) 
PSE Bitmap graphics (IBM printer Page SEgment) 
PSF Outline PostScript printer font (ChiWriter) 
psf Sony Playstation sound format 
psf Windows Server Update Services patch storage file 
psh Pusher game archive 
PSI A-law audio file (psion) 
psion Psion a-law sound file 
psk Unreal Character File 
psl Mastercook layout file  
psm Protracker Studio module (sound) 
PSM Sound data file (Epic Pinball) 
psm Sound data for Epic's games 
PSM Studio module (ProTracker)  
PSM Symbol table of IDE (Turbo Pascal) 
PSP Image file (PaintShop Pro) 
PSP Procedure (Prodea Synergy) 
PSR Report file (PowerSoft) 
pst Microsoft Office Outlook personal folder file 
pst MIDI Studio preset file 
PST Personal Folder File (Microsoft Outlook) 
pst Yamaha pianist (solo piano) style 
PT3 Device driver (Harvard Graphics 3.0) 
PT3 Template (PageMaker 3.0) 
PT4 Template (PageMaker 4.0) 
PTB Peachtree backup file 
PTB Script file (PubTech BatchWorks) 
PTB Table file (Pro/Engineer) 
PTD LiveNote Portable Transcript document 
PTD Table file (Pro/ENGINEER) 
PTF LiveNote Portable Transcript file 
PTF ProTracker Tennis Match file 
ptg Nova Logic game effects definition file 
pti IBM Configurator configuration 
ptl Nova Logic game particle file 
PTL Petal file (ASCII version of Microsoft Visual Modeler) 
ptm BioWare Aurora Engine plot manager 
PTM Macro (PubTech BatchWorks) 
PTM Music module (MOD) (Polytracker) 
ptm Poly Tracker module 
ptm PubTech BatchWorks macro file 
PTN PaperPort (ScanSoft) thumbnail image index file 
PTR QWK reader pointer file (QMail) 
pts Half-Life map creation debug file  
pts Infinity Engine game tileset 
ptt BioWare Aurora engine blueprint file 
ptu Nova Logic effects definition file 
ptx Rayman 2 file 
PTX RealLegal Portable E-Transcript viewer file 
PUB Document (Microsoft Publisher) 
pub Microsoft Publisher document 
PUB Public key ring file (PGP) 
PUB Publication (Ventura Publisher) 
pub The Sims family data game file 
PUD Map file (WarCraftII) 
pud WarCraft map file 
puma Pumatraker file 
PUT Compressed archive (PUT) 
PVD Script file (Instalit) 
pvi PODBot knowledge file 
PVL Library file (Instalit) 
pvm Sonic Adventure DX game object file 
pvr Sonic Adventure level file 
PVT Local pointlist (Fidonet) 
PW Text file (Professional Write) 
pw3 Pulse Player file 
PWD Word document (Microsoft Pocket) 
PWL Password list file (Microsoft Windows 9.x) 
pwl Windows Password file 
PWP Image file (a roll of film viewed using Photoworks) 
PWP Text document (Professional WritePlus) 
PWZ PowerPoint wizard (Microsoft) 
PX Primary database index (Paradox) 
pxc MatrikonOPC server configuration file 
pxg PixRef Pro configuration file 
pxi PlexTools disk image 
PXL Pocket Excel spreadsheet (Microsoft) 
pxp POD-Bot file 
PXW Pixtran file 
PY python Script file 
PY Saved emessages (YAHOO) 
PYC python Compiled script file 
PZD Default settings (Pizazz Plus) 
pzl Lode Runner puzzle set 
PZO Overlay file (Pizazz Plus) 
pzp Jigs@w saved puzzle 
PZP Palette (Pizazz Plus) 
PZS Settings (Pizazz Plus) 
PZT Transfer file (Pizazz Plus) 
PZX Swap file (Pizazz Plus) 
QAD Document (PF QuickArt) 
QAG Quick Access Group data file (Norton Desktop) 
QAP Application file (Omnis Quartz) 
QBE Saved query (dBase IV) 
QBE Saved Query (Quattro Pro) 
QBM QuickBooks Portable Company file 
QBO Compiled query (dBase IV) 
QBS Program file (Microsoft QuickBasic) 
QBW Spreadsheet data (QuickBooks for Windows) 
qc-emod QuadraComposer audio file 
QCP Voice file (Qualcomm Pure Voice) 
QD0 Data file-segment 10 (Omnis Quartz) 
QD1 Data file segment 1 (Omnis Quartz) 
QD2 Data file segment 2 (Omnis Quartz) 
QD3 Data file segment 3 (Omnis Quartz) 
QD3D QuickDraw 3D Metafile (Apple) 
QD4 Data file segment 4 (Omnis Quartz) 
QD5 Data file segment 5 (Omnis Quartz) 
QD6 Data file segment 6 (Omnis Quartz) 
QD7 Data file segmnet 7 (Omnis Quartz) 
QD8 Data file segment 8 (Omnis Quartz) 
QD9 Data file segment 9 (Omnis Quartz) 
QDF Data file (Quicken) 
QDK Backup of startup files (QEMM) 
QDT Data file from the Quicken UK Accountancy/Tax/Invoice program (QuickBooks) 
QDV Graphics file (Steve Blackstock Giffer) 
QEF Query file (Microsoft Excel) 
QEL Electronic library file (Quicken) 
QFL Document (FAMILY LAWYER) 
QFX Fax (QuickLink) 
QIC Backup file (Microsoft) 
QIF Image (MIME)(QuickTime) 
QIF Import file (Quicken) 
QLB Library file (Microsoft C/C++) 
QLB Library file (Quick) 
QLC Data (PostScript help file) 
QLP Printer driver (QuickLink) 
QM Motion file (Quality) 
QM4 Option or services file (QMail 4.x Mail Door) 
QPR Generated query program (Microsoft FoxPro) 
qpr OS/2 print queue device driver 
QPR Print queue device driver (OS/2) 
QPX Compiled query program (Microsoft FoxPro) 
QQT Qardware definition file (Quick Qard Technology) 
QRP Report builder file (Centura) 
QRP Report file (Liberty for Windows 2.0) 
QRS Equation Editor support file (WordPerfect for Windows) 
QRT QRT graphics file (Ray Tracer) 
QRY Query (dBase IV) 
QRY Query (Microsoft) 
QSD Datafile (Quicken) 
QST Tab file (Quake Spy) 
QT Movie file (QuickTime) 
QTI Image file (QuickTime) 
QTIF Image file (QuickTime) 
QTM Movie file (QuickTime) 
QTP Preferences file (QuickTime) 
QTS Image file (QuickTime) 
QTS PICT image file (Macintosh) 
QTX Image file (QuickTime) 
qtz MAC OS X Quartz graphics file 
QUE CuteFTP Queue File 
que PDP-10 queue file 
QUE Perseus Development Corporation SurveySolutions Questionnaire 
QW Write program file (Symantec Q and A) 
QWK Message file (QWK Reader) 
QXD Data file (QuarkXpress) 
QXL Element library (QuarkXpress) 
QXP Project file (replaces QXD file as of QuarkXPress 6) 
QXT Template file (QuarkXpress) 
qze QZip encrypted file 
R Ratfor file (FORTRAN Preprocessor) 
R Resource file (Pegasus Mail) 
r36 Recomposer MIDI Sequencer music file  
r3p Yamaha RS7000 file 
R8 Raw graphics (One byte per pixel) plane one (PicLab) 
r81 Microsoft Flight Simulator texture file 
r82 Microsoft Flight Simulator texture file 
R8P Pcl 4 bitmap font (Intellifont) 
ra RealAudio 
RA RealMedia streaming audio file 
RA3Autosave Command & Conquer Red Alert 3 save game file 
RA3Campaign Command & Conquer Red Alert 3 save game file 
RAD Radar data file (Radar ViewPoint) 
rad Reality AdLib Tracker 2 file 
ram Real Audio metafile 
RAM RealMedia metafile 
RAO ReadAllOver (YOUniverse) 
rap RunAs Professional configuration 
RAR Java JCA Resource Adapter Module 
RAR WinRAR Compressed Archive 
rarenx Egis encrypted RAR file 
RAS Bitmap (Sun Raster Images) 
ras Max Payne game data file 
rast Spore texture, model file 
RAT Datafile (RATS) 
RAV Norton Antivirus file 
RAV Rave file (used by programmers) 
RAW Raw File Format (bitmap) 
RAW Raw signed PCM data 
RAW Raw signed PCM data 
raw RAW sound file 
raw RDosPlay audio format 
raw RealAudio sound 
raw Sentry 2020 encryption file  
rb Rosebud configuration profile 
RBF Datafile (Rbase) 
RBH Maintained by RoboHELP, the RBH file adds to the information contained in the Help 
rbz Rail Baron Player saved game  
RC Configuration file (emacs) 
rc Emacs configuration record 
RC Resource script (Borland C++) 
RC Resource script (Micosoft C/C++) 
rc2 ReCycle audio loop  
rcd Formula 1 car race 2001 Season01 drivers file 
rcf Colin McRae car race configuration file 
rcf Prototype game file 
RCG Newsgroup file (Netscape) 
rcm Polarmap calculator configuration 
rcs Colin McRae Rally saved game file 
RD1 Registered level file (Descent1) 
rda ANNO 1404 game data file 
rde Painkiller Overdose game file 
RDF Compiled UIC source code (Geoworks UI Compiler) 
RDF Research document information format 
RDF Resource Description Framework file (related to XML and metadata) 
RDI Device-independent bitmap file 
rdl Descent registered level file 
rdl RadioDestiny radio stream 
RDL Registered Level file (Descent) 
rdl Symbian recogniser library 
rdp Microsoft Windows Remote Desktop Connection settings 
RDX Datafile (Reflex) 
RDZ RemoteDocs compressed and encrypted file 
re4 Resident Evil 4 file 
REC Datafile (EpiInfo) 
rec Deluxe Ski Jump 3 hill record file 
rec RapidComm voice file 
rec Record file 
REC Record file (Sprint) 
REC Recorded macro (Microsoft Windows 3.x) 
rec Sprint record 
REC Voice file (RapidComm) 
RED Path information file (Clarion Modula-2) 
ref Atari ST guide ref links 
REF Reference file (Generic) 
ref Train Simulator object reference file 
REG OLE registration file (Microsoft Windows 3.x) 
REG Registration file 
REG Registration file (Corel) 
reg Registration Information 
reg Registry file for Windows 
rel Nintendo Wii relocatable module 
rel Nokia phone audio file 
REM Remarks file (Generic) 
rep Grand Theft Auto San Andreas replay 
REP Reply file (QWK Reader) 
REP Report file (CodeReporter) 
REP Report file (DataBoss) 
REP Report file (Report Designer) 
REP Report file (Visual dBase) 
rep Starcraft game replay file 
REQ Request file (Generic) 
res Championship Bass archive  
RES Compiled resource file (Borland C++) 
res Electranoid game file 
res Evil Islands game archive 
res FlyFF resource file 
res Fuzzy's World of Miniature Space Golf 
res Half-Life game map file 
res Infinity game engine character biography 
res Laser Light game archive 
res Rage of Mages game file 
RES Resource file (dBase IV) 
RES Resource file (Microsoft Visual C++) 
res SWAT 3: Close Quarters Battle archive file 
res System Shock 2 resource data 
res Xatax game archive 
REV Revision file (GeoWorks) 
rex ReCycle audio loop export file  
REX Report definition (Oracle) 
REX Source code file (REXX) 
rez LithTech game engine resource file 
REZ Resource file (Generic) 
RF Raster graphics file (Sun) 
rfa Battlefield 1942 game archive 
rfd Emperor: Battle for Dune game file 
rfl Reason sound bank 
rfm rFactor modification file 
rfm Rich music format 
RFT Revisable Form Text (part of IBM's DCA or Document Content Architecture) 
rg Rosegarden music file 
RGB, SGI RGB files (Silicon Graphics) 
rge Inno setup registry entries file 
rge R.A.G.E. driver 
rgn Championship Manager game file 
rgt Corsix's Mod Studio texture file 
rgu Microsoft Windows Mobile registry entry 
RGX Symbol tables (ReaGeniX code generator) 
RH Resource header file (Borland C++ 4.5) 
rh RobHubbard audio file 
RI Data file (Lotus 1-2-3) 
ri Xpand Rally Extreme race information data 
RIB Graphics in Renderman format (3DReality) 
RIC Fax document (Ricoh) 
rif FutuRUG encrypted resident information file 
RIF Image file (Metacreations Painter 5) 
RIF RIFF bitmap graphics (Fractal Design Painter) 
rif Rockwell ADPCM format  
RIP Graphics (remote access) 
RIX Bitmap graphics (ColorRIX VGA Paint) 
rix Softstar RIX OPL music format 
rl1 Descent 1 registered level file 
RL1 Regestered level file (Descent1) 
rl2 Descent 2 registered level 
RL2 Registered level file (Descent2) 
RL4 Bitmap graphics file 
RL8 Bitmap graphics file 
RLA Wavefront raster image (SDSC Image Tool) 
RLB Data file (Harvard Graphics Win 9.x) 
RLC Graphics file (1 bit per pixel scanner output file) 
RLE Run-Length Encoded bitmap (SDSC Image Tool) 
rlv Tacx Fortius file format 
RLZ Realizer source code file (CA-Realizer) 
RM Video file (RealAudio) 
RMB RegistryMaster branch 
RMD Document (Microsoft RegMaid) 
RMF Rich Map Format (used by 3-D game editors to store a map) 
RMF Rich music format (Beatnik) 
RMI MIDI music 
rmi MIDI-sequention music (RIFF RMID format) 
rmj RealAudio media file 
RMK Makefile (Clipper RMake) 
rmp RIFF MP3 audio file  
RMVB RealVideo Variable Bit Rate File 
rmx RealMedia secure media clip 
RN Xpl Program file (Nota Bene) 
RND Rendering slide (AutoCAD-AutoShade) 
RNO Runoff file (VAX) 
rns Reason audio file 
rns Renoise professional music tracker file 
rnx RealPlayer audio file 
roacj Call of Juarez game resource data file 
rockwell Rockwell (modem) file 
rockwell-2 Rockwell 2-bit ADPCM data 
rockwell-3 Rockwell 3-bit ADPCM data 
rockwell-4 Rockwell 4-bit ADPCM data 
rod Hot Rod American Street Drag game file 
rol AdLib Visual Composer music data file 
ROL FM music Adlib Music file (Roland) 
ROM Cartridge-based home video game emulator file (exact copy of ROM contents in cartridges 
ROQ Id software game file 
ROV Data file (Rescue Rover) 
rov Rescure Rover game data 
rpack Call of Juarez game data file 
RPD Database (RapidFire) 
rpf Grand Theft Auto IV RAGE engine package file 
RPL Text document (Replica) 
rpl Toribash replay game file 
RPL Video file (Tomb Raider) 
RPM Package Manager (RedHat Linux) 
RPS Borland Translation Repository 
RPT Crystal Reports file ( and a sub-set of Microsoft Visual Basic) 
rpz Crystal Reports encrypted and zipped report file 
RRS Saved game file (Ace Road Rash) 
RS Datafile (Amiga Resource Reassembler) 
rs Xpand Rally Extreme replay file 
rsa PKCS7 signature file 
RSB Red Storm bitmap (Rainbow 6 (Game) and several image editing programs) 
rsc Carnivores Ice Age Map Areas file 
rsc NASCAR Racing paint shop controller file 
RSC Resource file (Generic) 
rsd Roland sound file 
rsh Warhammer 40,000 texture file 
RSL Paradox 7 reports (Broderland) 
RSM Resume file (WinWay Resume Writer) 
rsm RuneSword 2 game file 
rsml RealPlayer ML file 
rsp ODBC driver configuration file 
RSP Response file (Generic) 
rsrc MAC OS X resource file 
RS_ Resource fork file (Macintosh Mac-ette) 
rtb NAT proxy servers file 
RTC Rich Text Compressed file 
rte RTEncoder RTE encoded file 
RTF Help file script (Microsoft Windows 9.x) 
RTF Rich Text Format document 
rtk Adobe RoboHelp configuration file 
RTK Used by RoboHELP to simulate the search feature of Windows help 
RTL Run Time library (NU 7.0) 
RTL Text file (Generic) 
RTM Music module (MOD) (Real Tracker) 
rtm Real Tracker music module (MOD) file 
rtp Microsoft software update file 
RTP Software update package data file (RTpatch) 
rts RoboHelp configuration 
RTS RoboHELP to speed complex operations 
RTS RTSL document (RealAudio) 
RTS Runtime library file (CA-Realizer) 
rtx Mobile Phone ringtone  
RUL Extension used in InstallShield 
RUN Compiled output p-code file (Softworks basic compiler) (SoftworksLtd) 
rvi Revenant game archive 
rvm Revenant game archive 
rvp Microsoft Scan configuration file 
RVP Scan Configuration file (MIME) (Microsoft) 
rvr Revenant game archive 
RVW Review file (Generic) 
RWS Resource Workshop data file (Borland C++) 
RWX Script file (RenderWare) 
rxs AudioCentral Roxio markup sound 
RXX RAR compressed files from a multi-volume archive (xx = a number from 01 to 99) 
rzk File Crypt password file 
rzx File Crypt encrypted file 
s AKAI S1000/S1100/S01 sample 
s AKAI S3000/S3200/S2000/S2800 sample 
s AKAI S900/950 sample 
S Assembler source code (Unix) 
S Source code file (Scheme) 
s Train Simulator shape file 
S$$ Temporary sort file (Sprint) 
s2z S2Games Savage game compression 
S3I Instrument file (Scream Tracker v 3.0) 
s3i Sample file (Digiplayer/ST3)  
s3i ScreamTracker v3 instrument file 
S3M 16 channel music file (Scream Tracker v 3.0) 
s3m Digiplayer sample file 
s3m Scream Tracker v3 module 
s3p AKAI MESA II/PC S-series program file 
s7 Sibelius music notation file  
sa UNIX stub library 
sa2 Suprise! adlib tracker music module 
sab ALSong album file 
sab Sabotain game archive 
sad Black & White sound file 
sad Lucas Arts sound file 
SAI Encrypted video file (Integrated Sensors) 
sak Postal game archive 
SAL Datafile (SORITEC) 
SAM Document (AMI Professional) 
sam Signed 8-bit PCM file 
SAM Signed 8bit sample data file 
san Legacy of Kain series game file 
san Select-a-Net Network configuration 
SAR Compressed archive (SAR) 
sar Yamaha S.Art voice files 
SAS SAS program file 
SAS7BCAT SAS system catalog 
SAS7BDAT SAS system data set 
SAS7BNDX SAS system index 
sat SAdT Music Composer song file 
sat Surprise! Adlib tracker file 
SAV Backup file (Generic) 
sav Configuration data file 
SAV Configuration file (Generic) 
sav Daemon Tools Pro disk image 
sav Nova Logic saved game file 
SAV Saved game file (Generic) 
sav Saved game file type 
sav SpellForce 2 save game 
SAVE Doom 3 and Quake 4 Savegame File 
save Doom 3 saved game file 
save Prey save game file. 
save Salt Lake city 2002 game file 
Savedsearch Spotlight Saved Search 
saver Mac OS X Screen Saver 
SB Raw Signed Byte (8bit) audio data 
sb Signed byte (8-bit) data 
SB! Locking file (Superbase) 
SBD Data definition file (Superbase) 
SBD Storyboard data file (Storyboard Editor) 
SBF File data (Superbase) 
sbf Nova Logic game stream binary file 
sbi Creative labs SoundBlaster instrument 
SBI Instrument file (Creative Labs SoundBlaster) 
SBK Bank file (Soundblaster)/EMU SoundFont v1.x (Creative Labs Soundfont 1.0) 
sbk Creative Labs EMU SoundFont v1 bank file 
SBL Flash object (ShockWave) 
SBP Dml program file (Superbase 4) 
SBP Program file (Superbase) 
SBQ Query definition file (Superbase) 
SBR Support file (Source Browser) 
SBT Notes related to record data (Superbase 4 for Windows) 
SBV Form definition file (Superbase) 
SC Display driver (Framework II) 
SC Pal script (Paradox) 
sc SoundControl audio file 
sc2 Sample Cell II PC/Mac instrument 
SC2 SAS 6.12 catalog (Windows 95/NT, OS/2, Mac) 
SC2 Schedule+ 7.0 file (Microsoft) 
sc2 SimCity 2000 file 
SC3 Renamed dBase III screen mask file (dBase IV) 
SC3 Saved game file (SIMM City 3000) 
SC3 Screen device driver (Harvard Graphics 3.0) 
sc4 Game file format 
SC4 Level file (Roller Coaster Tycoon) 
SC7 SAS 8.2 catalog 
SCA Datafile (SCA) 
scb Command & Conquer World Builder file 
scc Active ScreenSaver Builder configuration file 
SCC Source Safe file (Microsoft) 
SCC Text file (Generic) 
scc Visual SourceSafe control file 
SCD Datafile (Microsoft Schedule+ 7.0) 
SCD Object description language graphics (Scodl Scan Conversion) 
SCD Slide image (Matrix/Imapro SCODL) 
scd Systems Management Server (SMS) site control file deletion 
SCF Command file (Microsoft Windows Explorer) 
scf Lotus Symphony spelling checker configuration 
SCF Multimedia show (ScoreMaker) 
scf SimTown file  
SCF Spell checker configuration file (Symphony) 
scf VIA setup configuration file 
scf Windows Explorer shell command file 
SCH Datafile (Microsoft Schedule+ 7.0) 
SCH Schematics file (ORCAD) 
SCI Fax document (SciFAX) 
SCI Inspire native format (ScanVec) 
sci Sierra AdLib audio file format  
sci System configuration information 
SCI System configuration information file (Generic) 
scm Grand Theft Auto III mission script 
scm ICQ Sound compressed sound scheme 
SCM Scheme source code file (Generic) 
scm Spanish Whiz scrambled game sound file 
scm StarCraft campaign map 
SCM Video game console ROM emulater file 
scn Flying-Model-Simulator scenery file 
scn Game scenario file 
scn Orbiter scenario file 
SCN Scene data file (TrueSpace2) 
SCN Screen file (Kermit) 
SCN Videowave Scene file 
SCO High score file (Generic game file) 
SCP Dial-Up Networking Script 
scp Palm OS configuration file 
SCP Script file (BITCOM) 
SCR Debug source code (DOS Debug) 
scr DOS DEBUG input file  
SCR Fax image (Generic) 
scr Nova Logic game dialog script file 
SCR Screen font file (LocoScript) 
SCR Screen snapshot file (dBase IV) 
SCR Screen snapshot file (Procomm Plus) 
SCR Screensaver file (Microsoft Windows 9.x) 
scr Windows screensaver file 
scr Xpand Rally Extreme player profile file 
scs Hunting Unlimited 3 game file 
scs SimCity Societies saved game file 
SCT CT bitmap (Scitex) 
SCT FoxPro forms (Microsoft) 
SCT SAS catalog (Dos) 
sct SimCity 3000 real-world terrain city 
SCT01 SAS catalog (Unix) 
SCTP Applescript script 
SCV CASmate Native format (ScanVec) 
SCX Bitmap graphics (ColorRIX) 
SCX Chart (Stanford Chart) 
SCX FoxPro forms (Microsoft) 
scx Game scenario file 
SCX Screen file (Microsoft FoxPro) 
SCY Security file (ReaGeniX) 
SD Audio (Sound Designer I) 
sd Entropic sound data format 
sd Sound Designer I file 
sd Train Simulator shape definition file 
SD2 Flattened file/data fork (Sound Designer II) 
SD2 SAS 6.12 data set (Windows 95/NT OS/2, Mac) 
sd2 Sound Designer 2 file 
SD7 SAS 8.2 data set 
SDA File archive description (Fidonet Software Distribution Network) 
sda Pretty Good Privacy (PGP) encrypted executable 
sdb Custom Application Compatibility Database 
sdc BigPond Music song file 
sdc Smart Diary Suite configuration 
SDC Spreadsheet (Staroffice)(StarCalc) 
SDD Presentation file (Staroffice)(Starimpress) 
sdf Audio file 
sdf Ground Control map file 
sdf Nova Logic game sound define file 
SDF System Data File Format legacy Unisys (Sperry) format 
sdg Smart Diary Suite graph configuration 
SDI Software distribution network information file 
SDK Floppy disk image (Roland) 
sdk Roland S-550/S-50/W-30 disk image file 
sdk Roland S-7xx series floppy disk image 
SDL Library file (SmartDraw) 
SDN Software distribution network compressed archive 
SDP Datafile (Cocreate SolidDesigner) 
sdp Fallout 3 shader package 
sdp RealAudio scalable multicast 
SDPC Datafile (Cocreate SolidDesigner) 
SDR Drawing (SmartDraw) 
sdr QuickView Pro for DOS soundcard driver 
sds MIDI Sample sound (DUMP standard file) 
SDS Raw Midi Sample Dump Standard file 
sdt Dungeon Keeper 2 game archive 
sdt Grand Theft Auto III audio structure data 
SDT Template (SmartDraw) 
sdt Theme Park World game archive  
SDV Semicolon Divided Values file 
sdv Smart Diary Suite voice file 
SDW Graphic file (Lotus WordPro) 
SDW Raw Signed DWord (32bit) data 
sdw Signed dwords (32-bit) data 
SDX Midi Sample Dump Standard files compacted by SDX 
sdx Sample DUMP exchange file  
sdx Sample sound file 
sd_ Audio Utility Midimach compressed file 
se1 Microsoft Flight Simulator scenery file 
SEA Self-expanding archive (used by Stuffit for Mac files and possibly by others) 
sec Diskreet encrypted file 
sec MP3 music file 
sec Pretty Good Privacy secret key ring file 
SEC Secret key ring file (PGP) 
SEC Secured animation file (Disney Animation Studio) 
SED Screen editor script files (SED) 
sef Encryptafile digital signature file 
sef Steganos encrypted file 
SEL Data file (Copy Books) 
SEP Printer seperator page (Generic) 
sep SimEnhancer 3D profile file 
sep Sony PlayStation sound sequence chunck format 
SEP Tagged Image File Format (TIFF) bitmap 
SEQ Animation file (Atari) 
seq Power Tracks Pro music sequencer file  
SEQ Sequential instruction file (Bubble Chamber) 
seq Sony Playstation MIDI sequence 
ses Adobe Audition session file 
ses HostAccess session configuration file 
SES Session file (Cool Edit) (common digital audio editor file ) 
SES Session information file (Clarion Modula-2) 
SESSION Internet Security Scanner file (ISS) 
set 1st Reader configuration 
set Configuration file 
SET Configuration file (1st Reader) 
set Diablo II character set 
set HostAccess session configuration template 
SET Install driver sets (Symphony) 
SET Setup option file (Generic) 
SET Voice set files (Quartet) 
set XANA Web Browser configuration file 
SEW Sewing program file (Generic) 
sex Urban Chaos game file 
sf IRCAM / MTU SoundFile format 
sf OS/2 work place shell attribute storage file 
SF SoundFile format (IrCam) 
SF Wps attribute storage file (OS/2 WorkPlace Shell) 
SF2 Bank file (Creative Labs Soundfont 2.0)(Soundblaster) 
sf2 Creative Labs SoundFont 2.0 bank file 
SF2 SoundFont file (EMU version 2.0) 
sfark Melody Machine compressed SoundFont 
sfc Microsoft Windows system file check file 
sfcache ReadyBoost cache file 
sfd Crysis game file 
SFD Sound File Data (SoundStage) 
sfd SoundStage sound data file 
sff Soldier Front Client map/weapon/character model 
sfi Acoustic Modeler acoustic image 
SFI Graphics file (SIS Framegrabber) 
SFI Printer font file (Hewlett-Packard Laser Jet Landscape) 
SFI Printer font file (Ventura Publisher) 
SFI Sound File Info (SoundStage) 
sfi SoundStage sound info file 
sfk Modem Spy sound file 
sfk Sony ACID PRO audio waveform file 
sfk Sony Sound Forge sound file 
SFK Sound file (Sonic Foundry) 
sfl AGON game file 
SFL Pcl 4 bitmap font (Intellifont) 
SFL Pcl 4 bitmap font (LandScape) 
SFL Pcl 4 bitmap font (Ventura Publisher) 
SFN Font file (SPX) 
SFP Pcl bitmap font (Intellifont) 
SFP Pcl bitmap font (Portrait) 
SFP Pcl bitmap font (Ventura Publisher) 
SFR Sample Resource (Sonic Foundry) 
sfr Sonic Foundry sample resource file 
SFS Pcl 5 scalable font file (Intellifont) 
SFT ChiWriter Screen Font 
SFT SoftGrid Program Package Container 
SFW Mangled JPEG (Seattle Filmworks) 
sfw Sound Forge XP studio project 
SFX Self-extracting archive (RAR) 
sfx SoundFX audio file 
sfz Audio SFZ instrument file 
SG Image file (SnapGraphix) 
SG1 Graphics file (Stanford Graphics) 
sga Relic Entertainment SGA archive 
sga Warhammer 40,000 audio archive file 
SGF Document w/graphics (StarWriter) 
SGF Graphics file (Sonique) 
sgf Smart Game Format file 
SGI Graphics file (IRIS) 
SGI Graphics file (Silicon Graphics) 
sgm Visual Boy Advance saved state file 
SGML Standard Generalized Markup Language 
sgp Acoustica MP3 Audio Mixer file 
SGP Statistics file (STATGRAPHICS Plus) 
sgr SimCity 4 graphics rules 
SGT Save/Get keyboard macro (Signature) 
sgw n-Track Studio packed song file 
SH ASCii archive (Unix/SHAR) 
SH Shell script (Unix) 
SH3 Presentaion file (Harvard Graphics) 
SHB Document shortcut file 
SHB Presentation (Corel Show) 
shd Constructor shadow file 
shd Microsoft Windows shadow spooler file 
shf Pretty Good Privacy (PGP) share 
SHG Bitmap (HotSpot) 
SHK Compressed Apple archive (SHRINKIT) 
SHK Compressed archive (Arthurian Shrink Archiver) 
SHM Shell macro (WordPerfect for Windows Library) 
SHN Audio compression file (Shorten) 
shn Shorten compressed audio file 
shp Command & Conquer file 
SHP DOS shapes file (3D Studios) 
SHP File format used by some programs for 3D modeling of multipart interactive triangle models 
SHP Shapefile spatial data format (used by many GIS programs) 
SHP Source code and shape file for text fonts (AutoCAD) 
SHR File archive (Unix ASCii) (SHAR) 
shs Microsoft Windows 95/98 clipboard 
SHS Shell scrap file; reportedly used to send "password stealers" 
SHT Pocket Spreadsheets file 
SHTML HTML file containing Server Side Includes (SSI) 
SHW Presentation (Corel Show) 
SHW Presentation (Harvard Graphics 2.0) 
SHW Slide Show (WordPerfect for Windows) 
SHX Shape entities (AutoCAD) 
SHX Shapefile spatial index file (ArcView) 
shy ShyFile encrypted file 
sib Sibelius music file 
sid Commodore 64 tunes and sound effects file (PlaySID) 
sid Microsoft Systems Management Server (SMS) software inventory delta 
sid1 SidMon audio file 
sid2 SidMon audio file 
sif Microsoft Windows NTsetup installation file 
SIF Setup installation files (Microsoft Windows NT) 
SIG Current program settings (Signature) 
SIG PrintMaster graphics file 
SIG Signature file (PopMail) 
SIK Backup files (Microsoft Word for Windows) 
SIK Backup files (Sicherungskopie) 
sin Rise of Nations campaign media file 
sin SiN game file 
SIT Compressed archive of Mac files (Stuffit) 
SIZ Configuration file (Oracle 7) 
SIZED Gallery resized photo image 
ska Pretty Good Privacy (PGP) secret keyring 
SKA Secret Keyring file (PGP) 
skd Max Payne model file 
SKF Drawing file (AutoSketch) 
SKL Resource file (Macromedia Director) 
skn The Sims 3D body mesh skin data 
SkuDef Command & Conquer Red Alert 3 file 
sl HP-UX shared library 
SL Save Layout extension (PACT) 
SL Source code file (S-Lang) 
SLB Slide Library File (AutoCAD) 
SLC Compiled SALT script (Telix) 
SLD Slide File (AutoCAD) 
SLDASM SolidWorks Assembly File 
SLDDRW SolidWorks Drawing File 
sldm Microsoft PowerPoint slide file 
SLDPRT SolidWorks Part File 
sldx Microsoft PowerPoint 2007 XML slide file 
slf Jagged Alliance 2 game file 
SLI Slide file (MAGICorp Slide Service) 
SLK Symbolic link spreadsheet (SLYK) 
SLL Sound data file (Generic) 
slp Rise of Nations campaign media file 
SLT Script application language (SALT) (Telix script source) 
SM Maillist (SoftSpoken Mailer) 
SM Script file (ScriptMaker) 
SM Simple MODRATEC Graphic 
SM Source code file (Smalltalk) 
SM Text file (Samna Word) 
SM3 Symbol file (DataCAD) 
sma Counter-Strike add-on source code  
smd J-Phone, SmdEd mobile song file 
smd Sega Genesis ROM emulator file 
smd Source engine SDK model source file 
SMD Video game console ROM emulator file 
SMF Fax document (SMARTFAX) 
smf Standard MIDI file format 
smht Sealed MHT archive 
smi Macintosh Disk Copy compressed image 
SMK Image file (Deer's Revenge) 
SMK Image file (Nascar Racing '99) 
SMK Image file (Smack Player) 
SMM Macro (AMI Pro) 
smp Ad Lib Gold sample file 
smp Avalon sample file 
smp Reason NN19 Sampler instrument patch 
SMP Sample file (AdLib Gold) 
SMP Samplevision format 
smp Samplevision sound format 
smp Swell sample file 
smp Warcraft 2 (Wargus/Stratagus) map file 
SMRailroadsSavedGame Sid Meier's Railoads save game file 
SMS Emulator ROM image file (8-bit Sega Master System) 
sms Sega Master System emulator ROM image file 
sms Train Simulator sound management system 
sms Warcraft 2 (Wargus/Stratagus) map file 
SMT SmartObject file (IconAuthor) 
SMT Text file (Smart Ware II) 
SMW Simpl Windows for Crestron processors 
SMZIP Stepmania package format 
sn2 Sound Club file 
SNA Drive Snapshot compressed Disk Image file 
snd AKAI MPC-series sample file 
snd Amiga IFF/8SVX Sound 
snd ATARI digitized sound file  
snd Generic sound file 
snd Heroes of Might & Magic 3 archive  
snd Interplay/MusicStudio sound 
snd Macintosh sound resource file 
snd NeXT sound file  
SND Raw unsigned PCM data 
snd Resource Fork sound 
SND Sample (AKAI MPC) 
snd Software Toolworks sound 
SND Sound file (NeXt) 
SND Sound resource (Macintosh) 
snd Sounder/Soundtools sound file 
snd Sun/NeXT/Tandy/Apple Macintosh sound file 
snd Unix sound file, similar to AU 
snd Unsigned 8-bit PCM sound data 
snd Wired For Sound file 
SNDR Sound file (Sounder) 
sndr Sounder sound file 
sndt Sndtool sound file 
SNDT Sound file (SndTool) 
sng Adlib Tracker file 
sng DeskMate song file 
sng Faust Music Creator file 
sng GoatTracker C64 song file 
sng KORG song file 
SNG Midi song file (Midisoft Studio) 
SNG Midi song file (Prism) 
sng Midisoft Studio midi song 
sng SNGPlay file 
sng Song file 
sni MDK game archive 
SNM Mailbox (mail folder) index (Netscape) 
SNO Source code file (Snobol4) 
SNP Microsoft Access database snapshot file 
SNP Output video file (Computer Eyes) 
snx Starcraft saved game 
SO Shared library file (Unix)(equivalent to a Windows DLL) 
so3 Creative Labs SoundBlaster Studio MP3 sound file 
sod Star Trek Armada 3D image file 
sod Wolfenstein 3D Spear of Destiny game data file 
SOL Solution file (Common used with game examples,tutorials) 
SOM Network serial numbers (Quattro Pro) 
SOM Sort information files (Paradox) 
SON Song file (Creative Labs SoundBlaster Studio II) 
sonic SonicArranger audio file 
sos Adventure SOS compiled adventure game walkthrough 
sou Creative Labs SoundBlaster Studio sound file 
sou Lucas Arts sound file 
SOU Sound file (Creative Labs SoundBlaster Studio) 
sox Unix Sox native raw sound 
SP Compressed archive for Unix (Sprint) 
sp Supaplex demo file 
SP2 Quake2 pcx 8-bit sprite builder file 
SP3 Quake2 pcx 32-bit sprite builder file (for use with CyberPunkQE) 
sp4 Roller Coaster Tycoon saved game 
SP4 Saved game (Roller Coaster Tycoon) 
SPA FutureSplash Flash file (Macromedia) 
sparc SunOS 4 file 
spawn S.T.A.L.K.E.R. game file 
spc Interact Shark port code save file 
spc Nintendo SNES audio file 
SPC Program file (Microsoft MultiPlan) 
spc SpchComp encoded speech  
SPC Temporary file (WordPerfect for Windows) 
spd Adobe postscript printer mini driver 
SPD Data file (Speech) 
SPD Scalable font (Harvard Graphics 3.0) 
SPD Scalable font (Speedo) 
spd Speech data file 
spd SpyProof! encrypted disk data 
speex A Free Codec For Free Speech 
SPF Slide presentation file (EnerGraphics) 
spf StorageCraft ShadowProtect full image 
SPG Glossary file (Sprint) 
SPI Graphics file (Phillips Scanner) 
SPI Graphics file (Siemens Scanner) 
spk SpyProof! encrypted symmetric key file 
spk Wolfenstein 2009 game file 
SPL Compressed archive (SPLINT) 
SPL Customized printer driver (Sprint) 
spl Digitrakker sample file (by n-FACTOR) 
spl Infinity game engine spell file 
spl Microsoft Windows printing spool file 
SPL Object file (ShockWave Flash) 
SPL Personal spell dictionary (Signature) 
SPL Printer spool file (Microsoft Windows 3.x) 
SPL Sample file (DigiTracker) 
SPL Sample file (Generic) 
spl Sample file (Generic) 
SPM Data file (WordPerfect for Windows) 
spm StoneTracker audio file 
SPP Printer file (Sprint) 
SPPACK Sound sample (SP Pack) 
sppack SPPack sound sample 
spr Constructor sprite file 
SPR Document letter (Sprint) 
SPR Generated screen program (Microsoft FoxPro) 
spr Live for Speed single player replay 
spr Quake 3D engine sprite 
SPR Sprite (Image layering and resizing) 
spr Star Trek Armada sprite information  
SPRITE Bitmap file (Acorn) 
SPS Screen driver (Sprint) 
sps Sprint screen driver 
SPS Spssx source code file (VAX/VMS) 
sps StoneTracker audio file 
spt Liquid Audio Player secure portable track file 
SPT Source code file (Spitbol) 
SPT Support file (MITAC disk/system management utility package) 
SPU Picture file (Spectrum 512) 
spv American McGee Alice saved game file 
SPW Worksheet (SigmaPlot) 
SPX Compiled screen program (Microsoft FoxPro) 
spx Speex encoded audio 
SPZ SudoKoach puzzle 
SPZ SudoKoach puzzle file 
SQC Structured Query Language (SQL) common code file 
sqh Harbinger game file 
SQL Generally used by database products as an extension for SQL queries (scripts, text, or 
SQL SQL queries (Informix) 
SQP Query result of audio search (Sonique) 
SQR Structured Query Language (SQL) program file 
SQZ Compressed archive (SQUEEZE) 
src Bioware Infinity game engine text storage 
SRE Undefined file (Motorola) 
SRF Raster graphics file (Sun) 
sri Dragon NaturallySpeaking audio file 
SRM Video game console ROM emulator file 
SRP SCript file (QuickLink) 
srt Siemens mobile phone C60 sound file 
srv BNBSURVEY configuration file 
srv North American Locomotive Works file 
SRZ Source file (DataFlex) 
SS Bitmap graphics (Splash) 
ss Screen saver file 
ss Snappy configuration file 
ss XShipWars sound scheme file  
SS4 MODRATEC SigScribe4 Railway Signal Interlocking Design Data File 
SS5 MODRATEC SigScribe5 Railway Signal Interlocking Design Data File 
ssa Empire Earth custom assets file 
SSA Video file (Sub Station Alpha) 
SSD Datafile (SAS/PC) 
SSD SAS database (Dos) 
SSD01 SAS data sets (Unix) 
ssf BioWare Aurora engine sound set 
ssf Sound set file 
SSF Spreadsheet file (Enable) 
SSP Datafile (SAS Transport) 
SSV Quake 2 Savegame File  
ST Disk Image file (Atari) 
st Homeworld file 
ST Instrument library (Scream Tracker) 
st Scream Tracker instrument library 
ST Source code file (Little SmallTalk) 
ST Stamp file (NeoPaint) 
sta Generally game saved state 
STA Saved state (Reflection 4.0) 
STA Stack file (SpinMaker Plus) 
STB Stub library (Genus GX Kernel) 
STD Standard script file (LocoScript) 
STD StarOffice Drawing Template 
STD State transition diagram graphic file (Prosa) 
STF Compressed archive (SHRINKTOFIT) 
stg Visual Pinball high scores file 
sth Lotus Domino stash file 
sti Sealed TIFF file 
STL Stereolithography file 
STM Music file (Scream Tracker) 
STM Music module (MOD) (Scream Tracker 2) 
stm Navy's NOWS secure login file 
stm ScreamTracker v2 module 
STM Shorter suffix for .shtml, an HTML file containing a server side include (SSI) 
STM State transition diagram model file (Prosa) 
STO Pascal stub OBJ file (Genus GX Kernel) 
STP Catia file 
stp NASCAR Racing track picture 
STQ Text file (Statistica) (StatSoft Software) 
str FiFa 2002 music file 
str Music file 
str Screensaver file 
STR Screensaver file 
STR Structure list OBJ file (dBase IV Application Generator) 
sts Creamware STS-series sampler program file 
STS Project status information file (Microsoft C/C++) 
sts ScreamTracker song format 
STS Song file (Music) (Scream Tracker) 
STT Taci Pixia palette file 
stuff Black & White II jokey file 
stuff Eve Online game archive 
STW Data file (SmartTerm for Windows) 
STW OpenOffice.org 1.0 Text Document Template 
STX Electronic book file (SmarText) 
stx Nova Logic game sound text xref 
stx Scream Tracker music interface kit 
STX Tax form (CA-Simply Tax) 
sty DirectMusic style  
STY Style sheet (Generic text and graphics programs0 
STY Style sheet (Ventura Publisher) 
sty Yamaha general style 
SUI Suit library (Simple User Interface Toolkit) 
SUM Summary file (Generic) 
SUN Rasterfile graphics (Sun) 
sun SUNTronic song  
SUP Supplementary dictionary files (WordPerfect for Windows) 
supported MAC OS X file 
sv1 RollerCoaster Tycoon saved game 
sv1 Transport Tycoon saved game 
sv2i Symantec Backup Exec file 
SVD Autosave file for document (WordPerfect for Windows) 
SVF Simple Vector Format 2D image (Microstation) 
SVG Autosave file for glossary (WordPerfect for Windows) 
SVG Return To Castle Wolfenstein Savegame File 
svg Saved game file 
SVG Scalable vector graphics file (Adobe) 
svi Red Faction game file 
svm Formula 1 car race 2001 save game 
svm MRC-PRO format music file 
SVP Graphics file (Sonique) 
svq InfoBind file format 
svq MRC-PRO format music file 
svq Roland Keyboard midi sequence 
SVS Autosave file for style sheet (WordPerfect for Windows) 
SVX Interchange file format, 8SVX/16SV 
svx Sound file (Amiga 8SVX format) 
SVX Sound file (Amiga 8SVX) 
SVY Database file (SAVVY/PC) 
sw 16-bit Sound Raw Signed PCM data file 
SW Raw signed Word (16bit) data 
swa Adobe Shockwave music file 
SWA Shockwave audio file in Macromedia Director (an MP3 file) 
swc Spanish Whiz conversation sound file 
swd Settlers II Map file 
swd Sound File 
swd Spanish Whiz dictation sound file 
swe NHL Ice Hockey 2002 required file 
SWF Object (ShockWave Flash) 
SWG Swag Packet file (SWAG Reader) 
SWP Document backup file (Sprint) 
swp Swap file 
SWP Swap file (DataCAD) 
SWP Swap file (DOS) 
sww ANNO saved game file 
sxc HPXView SONET/SDH Crossconnect configuration file 
SXC OpenOfficeCalc file 
SXD StarOffice Drawing 
sxm Sealed XML document 
sxt Propellerheads Reason 2 NN-XT sound format 
sxt Singles game archive 
SXW OpenOffice.org 1.0 Text Document 
SY1 Smartpix symbol library (Ami Pro) 
SY3 Symbol file (Harvard Graphics 2.0) 
SYD Backup of startup files (QEMM) 
SYLK Microsoft Excel spreadsheet file 
SYM Precompiled header file (Borland C++) 
SYM Program symbol table (Generic to compilers) 
SYM Symbol file (Harvard Graphics 2.0) 
syn Breakneck / N.I.C.E.2 archive file 
syn Excessive Speed archive file 
SYN SDSC Synu image file (SDSC Image Tool) 
SYN Synonym file (Microsoft Word 5.0) 
syn Synthesis audio file 
SYS Datafile (SPSS/PC) 
SYS Datafile (SYGRAPH) 
SYS Datafile (SYSTAT) 
sys System configuration  
sys System device driver 
sys System file  
SYS System file (Generic) 
SYS System file Device driver or hardware configuration file 
SYW Graphics symbols (Harvard Graphics) 
syw Harvard Graphics symbol graphic file 
SYW Wave file (Yamaha SV-series) 
syw Yamaha SY-85/SY-99 wave file 
syx Roland D-50 patch SysEx dump file 
syx Roland MT-32 timbre SysEx dump file 
syx Yamaha DX11 / TX81z voice SysEx dumps file 
syx Yamaha DX21 / DX27 / DX100 voice SysEx dumps file 
syx Yamaha DX7 voice SysEx dumps file 
syx Yamaha DX7s / DX7II / DX200 voice SysEx dumps file 
T Source file (TADS) 
T Tape archive (TAR) (Without compression) 
T Tester symbol file (ReaGeniX code generator) 
T2T Modeling software file (Sonata CAD) 
T44 Temporary file for sorting index (dBase IV) 
T64 Emulator tape image file (Commodore 64) 
TAB Guitar Tablature file 
TAB Table file (MapInfo GIS) 
tad Total Annihilation demo saved game data 
taf ADRIFT text adventure file 
TAG Query tag name file (DataFlex) 
TAH Turbo assembler help file (Borland C++) 
tak TAK lossless compressed audio 
TAL Text illustration file (TypeAlign) 
tao IsoBuster file 
tap Wave sound 
TAR Compressed archive (TAR) 
TAR Tape Archive 
TAZ Compressed ASCII archive (COMPRESS) 
TAZ Compressed ASCII archive (TAR) 
TAZ Gzip/Tape archive (Unix) 
TB1 Font file (Borland Turbo C) 
TB2 Font file (Borland Turbo C) 
tbb The Bat! e-mail hives 
TBF Fax document (Imavox TurboFax) 
TBK Interactive multimedia files (Asymetrix Toolbook) 
TBK Memo backup file (dBase IV) 
TBK Memo backup file (Microsoft FoxPro) 
TBK Toolbook file (Asymetrix Toolbook) 
tbl Dynamic link library 
TBL Graphics (Native format) (Pagemaker TableEditor) 
tbl OS/2 table of values  
tbl Starcraft information table  
TBL Table of values (OS/2) 
TBO Turbo Architecture Database (used by U.S. Federal Highway Administration's "Turbo 
tbr Norton Desktop custom toolbar file 
tbr SoftQuad XMetaL configuration file 
tbs Chess Tablebase file 
TBS Text elements (Microsoft Word for Windows) 
tbs TuneUp style boot screen file 
TBX Table (Project Scheduler 4) 
tc Borland C++ configuration file 
TC Configuration file (Borland C++) 
TC Configuration file (Turbo C) 
TCF Test Crafter File (storage file for tests developed in Cambridge UP software) 
TCH Turbo C Help file (Borland C++) 
TCL Script in the TCL/TK Language 
tct Championship Manager game file 
TCW Drawing file (TurboCAD for Windows) 
TD Configuration file (Turbo Debugger for DOS) 
TD0 Disk image file (Teledisk) 
TD2 Configuration file (Turbo Debugger for WIN32) 
TD4 Saved track design (Roller Coaster Tycoon) 
tdb Ballance high score database 
TDB Database file (TACT) 
TDB Database file (Thumbs Plus) 
tdb NHL game exhibition roster file 
TDDD A file format use by the Imagine and Turbo Silver ray-tracers 
TDF Font file (TheDraw) 
tdf Total Annihilation features file 
tdf TTDAlter data file 
TDF Typeface definition file (Speedo) 
TDH Help file (Turbo Debugger0 
tdi Toshiba Disc Creator image file 
TDK Keystroke recording file (Turbo Debugger) 
TDS Symbol table (Turbo Debugger) 
TDW Configuration file (Turbo Debugger for Windows) 
ted Tribes 2 game file 
TEF Fax document (Relisys TEFAX) 
TEL Hostfile (Telnet) 
TEM Input template (IconAuthor) 
tem RPG Toolkit character file 
TEM Turbo Editor Macro Language script (Borland C++) 
temp Audiogalaxy downloading music file 
ter Black & White II terrain data 
tex Croateam Serious game engine texture file 
TEX Datasheet file (Idealist) 
tex Freedom Fighters texture file 
tex Hitman game file 
TEX TEX text file (Scientific Word) 
TEX Texture file 
tex Windows Hover! game texture file 
texturepack Arena Wars texture pack 
TF Configuration file (Turbo Profiler) 
TFA Area file (Turbo Profiler) 
TFC Catalogue file (Tobi's Floppy Disk Cataloguer) 
TFH Help file (Turbo Profiler) 
TFM Form file (Form Tool Gold) 
TFM Tagged font metric file (TeX) 
TFM TeX font metrics file (TeX) 
tfmx Final Musicsystem eXtended Amiga audio file 
TFS Statistics file (Turbo Profiler) 
TFW ArcView World file for TIF image (GIS application) 
tfx TFMX audio file  
TG1 Project file (On Target) 
TGA Targa bitmap (Adobe Acrobat,TrueVision) 
TGA Targa bitmap (Countour Mortgage Loan Format) 
TGA Winpoint Loan file (Microsoft Excel) 
TGQ Movie file (Dungeon Keeper 2) (Bullfrog Software) 
TGV Video file (Electronic Arts) (Need for Speed I/II/III, NBA '96) 
TGZ Gzip/Tape archive (Unix) 
THAI Husquvania sewing machine file 
that they match 
the result of sending e-mail with attachments in AOL. The files in a multipart MIM file can be 
the result of sending e-mail with attachments in AOL. The files in a multipart MME file can be 
THEME Desktop theme (Microsoft Windows 9.x) 
thm OpenOffice.org configuration file 
THM Thumbnail image file (Microsoft Clip Gallery v.1.x) 
thmx Microsoft PowerPoint 2007 theme file template 
THN Thumbnail (Graphics Workshop for Windows) 
THS Thesaurus dictionary (WordPerfect for Windows) 
ti Homeworld tactical icon 
TIF Tag image bitmap file (TIFF) 
TIFF Tag image bitmap file (TIFF) 
TIG Map file (Tiger) (Used by the US Government to distribute Map files) 
TIL Fuzzy Logic knowledge base file (Togai InfraLogic Fuzzy-C Compiler) 
til Nova Logic game tile file 
til Zelda Classic tile 
TIM Texture/Image file (Playstation) 
tim The Incredible Machine level file 
TIS Tile set (MahJongg 3.0) 
tit Train Simulator track interactive table 
TJF backup files (VAXTPU Editor) 
tlb OLE type library 
TLB OLE type library files (Microsoft) 
TLB Reference table (Bubble Editor) 
TLB Text library (VAX) 
TLB Type library (Visual C++) 
TLC Compiled tool command language source code file (Swat) 
tlc The Lost Crown saved game file 
TLE Two-Line element set (NASA) 
tlk Bioware Infinity game engine lookup table file 
tlk Lands of Lore archive 
tlk Legend of Kyrandia 2: Hand of Fate archive 
TLP Project timeline file (Microsoft Project) 
tls Piles'O'Tiles information file 
TLX Data file (Trellix) 
TMD TextMaker document from SoftMaker 
TMF Tagged font metric file (WordPerfect for Windows) 
TMO Ztg global optimizer default optimizer file (Zortech C++) 
TMP Temporary file (Microsoft Windows) (ALL) 
TMS Script file (Telemate) 
TNV Data file (BitWare) 
to an EML file before opening) 
toc Eudora table of contents 
TOC Table of contents file (Eudora Mailbox) 
toc World of Warcraft add-on information file  
tod Crysis game file 
TOL Image file (Kodak Photo Enhancer) 
topics 
topics 
TORRENT BitTorrent file 
TOS Self-Extracting archive (Atari ST) 
TOS The Operation System for Atari line of 16/32 and 32/32 computers 
TP Configuration file (Turbo Pascal) 
TP Sesson-state file (Turbo Profiler) 
TP3 Template file (Harvard Graphics) 
TP4 Saved picture file (Roller Coaster Tycoon) 
TPB Downloadable PCL Soft font file backup (HiJaak) 
TPF Downloadable PCL Soft font file (HiJaak) 
TPH Help file (Turbo Pascal) 
tpj Nova Logic game terrain project file 
TPL Encrypted lesson file (TutorPro) 
TPL Residents units library (Turbo Pascal) 
TPL Template file ( Cakewalk Audio) 
TPL Template file (DataCAD) 
TPL Template file (Harvard Graphics 2.0) 
TPP Project file (Teleport Pro) 
TPP Protected mode units (Borland Pascal 7.0) 
TPU Command file (VAXTPU Editor) 
TPU Turbo Pascal Unit (Turbo Pascal)(BGI) 
TPV Packed graphics file (TutorPro) 
TPW Packed wave files (TutorPro) 
TPW Session-state file (Turbo Profiler for Microsoft Windows) 
TPW Turbo Pascal Unit (BGI) (Turbo Pascal for Windows 9.x) 
TPX Image file (ULead Photo Express) 
TPZ Compressed archive (GNUzip) 
TPZ Compressed archive (TAR) 
TR Session-state settings (Turbo Charge Debugger for DOS) 
TR2 Session-state settings (Turbo Charge Debugger for Win32) 
TRA Saved game file (Coaster) 
TRC Debug support file (Power CTrace) 
TRE Directory tree file (PC-Tools) 
trf Train Simulator traffic pattern file 
TRIF Tiled Raster Interchange Format 
trk GeneRally track file 
trk IL-2 Sturmovik track file 
trk Mixman Studio track file 
trk RollerCoaster Tycoon track model 
TRK Script file (Kermit) 
trm Sound format (court record) 
TRM Terminal file (Generic) 
TRM Terminal settings file (Microsoft Windows 3.x) 
trn Nova Logic game mission terrain file 
TRN Project usage log (MKS Source Integrity) 
TRN Translation support file (Quattro Pro) 
trn VGA Planets game turn file 
trp Ports of Call saved game 
TRS Executable file (MicroGraphix) 
TRW Session-state settings (Turbo Debugger for Windows) 
TS HDTV sample file (Transport Stream MPEG-2 video stream) 
tsc FUEL game script 
tsc Top Secret Crypto Gold encrypted file 
tsd Nova Logic game tile surface defines 
TSH Broderbund Creatacard Transfer Project 
TSK Compaq iPaq picture image 
tsk Microsoft Windows system32 file 
tsk Skin file for Windows Mobile 
tsn Midi file 
tst Assassins's Creed game file 
TST Printer test file (WordPerfect for Windows) 
tst TAC compressed audio 
TSV Tab-separated values file 
tta TAU Producer file - TTA Lossless audio codec 
TTF TrueType font (Generic) 
ttg Command & Conquer Red Alert 3 file 
TTK Translation tool kit file (Corel Catalyst) 
TTO Client access data specification file (AS/400) (Server to Client) 
TUB Corel Paint Shop Pro Tube File  
tun FiFa World Cup file 
tun Lego Racers music file 
TUV Tutorial file (Many programs use this suffix for their tutorials) (Generic) 
TV Table view settings (Paradox) 
TV1 Overflow file above insert point in document 1 (WordPerfect for Windows) 
TV2 Overflow file above insert point in document 2 (WordPerfect for Windows) 
TV3 Overflow file above insert point in document 3 (WordPerfect for Windows) 
TV4 Overflow file above insert point in document 4 (WordPerfect for Windows) 
TV5 Overflow file above insert point in document 5 (WordPerfect for Windows) 
TV6 Overflow file above insert point in document 6 (WordPerfect for Windows) 
TV7 Overflow file above insert point in document 7 (WordPerfect for Windows) 
TV8 Overflow file above insert point in document 8 (WordPerfect for Windows) 
TV9 Overflow file above insert point in document 9 (WordPerfect for Windows) 
TVF Table view settings (dBase IV) 
tvm TV NOW Portable Video Recorder audio 
twc Tripwire configuration file 
twc TTWin configuration file 
twd System file 
TWF Data file (TABWorks) 
TWW Template file (TagWrite) 
TX8 MS-DOS text 
TXB Encoded briefing file (Descent/D2) 
txd Grand Theft Auto III texture dictionary 
txd RenderWare texture dictionary 
TXF Compressed archive (FREEZE) 
TXF Compressed archive (TAR) 
TXF Tax exchange format (Quicken and others) 
TXI Support file (TeX) 
txm trakAx Mixer configuration data 
TXT ASCII text-formatted data 
txt RTTTL / Nokring mobile ring-tone format 
txt Steinberg LM-4 bank file  
txtenx Egis encrypted TXT file 
TXW Wave file (Yamaha TX16W) 
TYM Time Stamp files (PageMaker 4.0) 
TZ Old compression file (TAR), (COMPRESS) 
TZB Compressed archive (Tar) 
U Subsampled Raw YUV Image 
u Unreal application pack 
u255law Exponential 8-bit sound format 
UAP User agent profile (Used by wireless telephony applications) 
uax Unreal audio file 
uax Unreal audio file 
ub 8-bit Unsigned byte RAW data 
UB Raw unsigned byte (8-bit) data 
UC2 Compressed archive (UltraCompressor II) 
uce Microsoft Windows XP system32 file 
UCN New compressed archive (UltraCompressor II) 
ucs Homeworld localized unicode strings 
UDF Image filter (Photostyler) 
UDF Unique Database (Microsoft Windows NT) 
udw Raw Unsigned DoubleWord (32-bit) data 
UDW Raw unsigned doubleword (32-bit) data 
UE2 Encrypted archive (UltraCompressor II) 
uea Protector Suite QL file 
ueed Uconomix Encryption Engine encrypted directory 
UFO Object file (Ulead) 
ufo Total Annihilation game archive 
UG Drawing file (AutoCAD and others) 
UHS Binary file (Universal Hint System) 
UI Espire source code (Geoworks UI Compiler) 
ui User Interface (Sprint) 
UI User interface file (Sprint) 
UIF Long prompts for Microsoft Windows (WordPerfect for Windows) 
uif MagicISO Universal Image Format - UIF file 
UIH Espire header file (Geoworks UI Compiler) 
ukx Unreal Tournament animation file 
UL Audio file (ULAW) 
ULAW (CCITT G.711) audio (US Telephony) 
ulaw Raw CCITT/ITU G.711 US telephony audio format  
ULD Uploaded file information (Procomm Plus) 
ULT Music module (MOD) (UltraTracker) 
ult Ultratracker music module (MOD) file 
ulw Raw CCITT/ITU G.711 US telephony audio format  
UMB Backup file (archive) (MemMaker) 
umod Unreal Self-extracting MOD File 
umx U-MYX Player song mix data 
umx Unreal Tournament music package  
umx Unreal Tournament music package  
UNI Datafile (Forcast Pro) 
UNI UniMod music module (MOD) (MikMod) 
uni UniMOD/MikMOD music module 
unity3d Unity project 
UNX Text file (Unix specific information) 
upd Universal print driver 
UPD Updated program data (dBase) 
UPD Updated program data (Generic) 
UPI Program file (ULead Photo Impact) 
upk Gears of War for Windows game file 
upk Mass Effect game file archive 
upload 
UPO Compiled updated datafile (dBase) 
UPX Saved Image file (ULead Photo Express) 
URF Universal radar format (Radar ViewPoint) 
URL Internet shortcut file (Universal Resource Locator) 
USA Unreal II Savegame File 
usa Unreal saved game file 
USE Source Integrity file (MKS) 
user Linux file 
usf Nintendo Ultra 64 sound format 
USP Printer font w/updated USACII extended character set (Pagemaker) 
USR Audit trail file (Pro/Engineer) 
usr Daqarta extended audio data 
usr ERGO receiver configuration file 
usr Uplink player information file 
USR User database file (Procomm Plus) 
USR User database file (Tour) 
USR User database file (Turbo C++) 
usx Unreal Static Meshes
ut2 Unreal Tournament map file 
utc BioWare Aurora game engine creature file 
utd BioWare Aurora game engine door file 
ute BioWare Aurora game engine encounter file 
uti BioWare Aurora game engine item file 
utm BioWare Aurora game engine store file 
utp BioWare Aurora game engine placeable object file 
uts BioWare Aurora game engine sound file 
uts BioWare Aurora game engine sound file 
utt BioWare Aurora engine trigger file 
utw BioWare Aurora engine waypoint file 
utx Unreal Texture File 
UU Compressed ASCII archive (UUDE/ENCODE) 
UU UU-encoded file 
uu Uuencoded (compressed) file archive (ascii) 
UUE Executable compressed ASCII archive (UUDE/ENCODE) 
UUE UU-encoded file 
uue UUEncoded file 
UW Raw unsigned 16-bit) datafile (Word) 
uw Unsigned word (16-bit) music file 
uwf UltraTracker WaveSample music file 
UWF Wave file (UltraTracker) 
V Consistency check support file (ReaGeniX Code Generator) 
V Main image input file (Vivid 2.0) 
v11pf ACDSee private folder 
V8 8-bit audio file (CoVox) 
v8 Covox 8-bit audio file 
vab Sony Playstation/PS2 bank file 
vag Sony Playstation/PS2 compressed sound file 
VAL Asset management document (Milliplex OmniValue) 
VAL Validity checks/referential integrity checks (Paradox for Windows) 
VAL Values list object file (dBase Application Generator) 
VAN Animation file (VistaPro) 
vap Annotated speech file 
VAP Annotated speech file (Generic) 
vap NetWare 2.xx value added process file 
VAR ASCII text file for data dictionary (Sterling Software Groundworks, COOL Business Team 
var Infinity game engine game start variable data 
VAR Variable file (IconAuthor) 
vb Sony Playstation wave bank body format 
VBA VBase file 
vbk CallPilot audio file 
VBP Project file (Microsoft Visual Basic) 
VBR Remote automated registration file (Microsoft Visual Basic) 
VBS Script file (Microsoft Visual Basic) 
VBW Workspace file (Microsoft Visual Basic) 
VBX Custom control file (Microsoft Visual Basic) 
VBX Visual basic extension (Microsoft Visual Basic) 
VC Include file with color definitions (Vivid 2.0) 
VC Spreadsheet (VisaCalc) 
vc4 Virtual CD track description file  
VCB Visual COMMBasic or VCBasic macro definition (created with Outsideview) 
vcd Virtual CD-ROM CD image file 
vcd VirtualDrive CD image file 
vce Natural MicroSystems voice file 
VCE Unformatted voice file (Natural Microsystems) (NMS) 
VCE Unformatted voice file (used by Cool Edit) 
vce Yamaha normal voice file 
VCF Configuration file; defines objects for use with Sense8's WorldToolKit (Vevi) 
vcf Vevi configuration file 
VCF Virtual card file (Many programs use this extension) 
VCF Virtual card file (Netscape) 
vcn NCDrive Vacon NX system software file 
vcr ATI Personal Video Recorder 
vcr Motocross Madness 2 video file 
VCT Class library (Microsoft FoxPro) (MFC) 
VCW Visual workbench information file (Microsoft Visual C++) 
VCX Class library (Microsoft FoxPro)(MFC) 
vd RJP1 Vector Dean audio file 
VDA Graphics image (Generic) 
VDA Targa bitmap 
vdi VirtualBox disk Image file 
vdmk VMware virtual disk file 
VDR Drawing file (ComputerEasy Draw) 
VDX Vector graphic file 
VDX Virtual device driver 
VDX XML for Visio drawing file 
VEL 3D drawing file (CAD( (Ashlar) 
vem Voice E-Mail file 
VEW View file (Clipper 5) 
VEW View file (Lotus Approach) 
VF Vegas Movie Studio File 
vfb Microsoft Office Outlook file 
vfd Drive Image5 Vfd file 
vfd Virtual PC virtual floppy disk image 
vff Vextus Factor compiled storage file 
VFL Clip art file (PrintMaster Gold) 
VFM Voting form (Voter) 
VFN Voting form for customers (VFN) 
vfs UFO game file 
vga VGA display driver 
VGA Video graphics array (Font type for display on a VGA Monitor) 
VGA Video graphics array (Monitor type, also defines if your monitor is compliant with the new 
vgd VGA CADD display driver 
VGD Visual display driver ( Generic CADD) 
vgi Vista Game Information 
VGR Graphics file (Ventura Publisher) 
vh Sony PlayStation Wave Bank Header Format file 
vhd Virtual Hard Disk file 
VI Graphics file (Jovian Logic VI) 
VI Virtual Instrument file (National Instruments LABView) 
VIC Graphics file (Vicar) 
vic Yamaha PSR-9000 custom voice  
VID Bethesda video files (Terminator, Future Shock) 
VID Bitmap graphics (YUV12C M-Motion Frame Buffer) 
vid Microsoft DOS video driver 
vid Monitor control file 
VID Screen device driver (Microsoft Word) 
vid Screen device driver (MS DOS/Word) 
VID Shell monitor file (Microsoft DOS v.5) 
VIF Khoros Visualisation image (SDSC Image Tool) 
VIFF Khoros Visualisation image (SDSC Image Tool) 
VIK Graphics Image (Viking) 
vip Samplitude project 
VIR File identified as a virus-infected file by Norton AntiVirus and possibly others 
VIS Graphics image file (VIS) 
viv Game info file 
VIV Streaming video file (VivoActive) 
VIZ dVS/dVISE file (Division) 
vl2 Tribes 2 game file 
VLB Library file (Corel Ventura) 
VLM Drafting program file (Vellum, by Ashler) 
vm Samsung cell phone voice memo 
VM Virtual memory file (Geoworks) 
vm1 Panasonic voice file 
vmc DESQview video monitor configuration  
vmc Virtual memory configuration file 
VMC Virtual memory configuration file (Adobe Acrobat Reader) 
VMD On-line video file (Sierra) (Torin's Passage) 
vmdk VMware virtual disk file 
vme Virtual Matrix encryption file 
VMF Audio file (FaxWorks) 
VMF Font characteristics file (Ventura Publishing) 
VML Vector markup language (used by Microsoft Office 2000) 
vmo Siemens SL45 mobile phone voice file 
VMS Text file with vms specific information 
vms VMS sound file 
vmtm VMware Team configuration file 
vmx VMware configuration file 
vmxf VMware configuration file for virtual machines in a team 
VNC Virtual Network Computing file used by Real and Tight VNC 
VO Include file with object definiton (Vivid 2.0) 
VOB Encrypted video and audio files used on current DVD's (Digital Video Disk) 
VOC Audio file (Creative Labs Sound Blaster) 
VOC Audio file (generated by RCA digital voice recorder) 
VOC Audio file (Quartet) 
voc Creative Labs sound file  
voc Quartet audio file 
voc Sound file 
VOF Object folder (VZ Programmer) 
vol Earth Siege 2 game archive 
vol Giants: Citizen Kabuto game archive 
vol Tribes game archive  
VOX Audio file (Talking Technology) 
VOX Dialogic audio file coded using ADPCM 
vox Dialogic sound 
VOX Formatted voice file (Natural Microsystems) (NMS) 
vox Natural MicroSystmes voice file  
vox SuperVoice voice file 
vox Talking Technology Incorporated file 
vox-6k Dialogic 4-bit ADPCM file  
vox-8k Dialogic 4-bit ADPCM file 
vp Conflict: Freespace game archive 
vp HomeWorld game file  
VP Publication (Ventura Publisher) 
vp VOCPACK lossless compressed audio  
vp6 Need for Speed Underover movie file 
VPG Graphics image file (VPGraphics) 
vpk EverQuest II game archive file 
vpk Steam NCF archive file 
vpk Verge pack file 
vpm VPIM voice message 
vpn WinGate VPN configuration file 
vpp Red Faction package file 
vpt Visual Pinball table 
VQA Video files (Westwood Studios) 
VQE VQ Locator file (Yamaha Sound) 
VQF VQ file (Yamaha Sound) (possible emerging standard) 
VQL VQ Locator file (Yamaha Sound) 
VRF Configuration file (Oracle 7) 
vrf Oracle configuration file 
vrf Ventrilo audio recording 
VRM Overlay file (Quattro Pro) 
VRML A VRML file 
VRP Project file (VXRexx) 
VRS Video device driver (WordPerfect for Windows) 
VS Include file w/surface definition (Vivid 2.0) 
vsb Virtual Sampler Bank file 
VSD Drawing file (flow chart or schematic)(Shapeware Visio) 
VSL Download List file (GetRight) 
VSM Simulation model (VisSim) 
VSN A Windows 9x/NT ViruSafe version file; used to keep information about all the files in a 
VSP Data print file (Schedule Soft) 
VSP Image sprite (SPX) 
vsq Vocaloid sequence file 
VSS Smartshapes image file (Shapeware Visio) 
VSS Stencil file (Shapeware Visio) 
VST Bitmap graphic file (TrueVison Vista) 
VST Targa bitmap (Generic) 
VSW Workspace file (Shapeware Visio) 
vtf Valve Steam compiled texture file 
vtx Steam source SDK compiled model file 
VUE Animation file (3D Studio) 
VUE View file (dBase IV) 
VUE View file (Microsoft FoxPro) 
vvf ViVerify fingerprint file 
VW Text file (Volkswriter) 
VWP Audio MetaSound plug-in (VoxWare Audio Compression Toolkit version 2.02.61) 
VWP Audio plug-in (Voxware MetaVoice Toolkit) 
VWR File viewer (PC Tools) 
vxd Microsoft Windows virtual device driver 
VXD Virtual device driver (Microsoft Windows 9.x) 
vy3 Samsung digital voice recorder format 
vy4 Samsung native proprietary voice codec 
w Train Simulator world file 
W Word chart file (APPLAUSE) 
w2a Yamaha Motif 'all' format 
w2v Yamaha Motif 'voices' format 
w2w Yamaha Motif waveforms format 
W30 Printer font (AST TurboLaser) 
W30 Printer font (Ventura Publisher) 
W31 Startup file (Microsoft Windows 3.1) 
w3d Wolfenstein 3D game data file 
W3L W3Launch file 
w3m Warcraft 3 map file 
w3v Warcraft 3 campaign progress record 
W44 Temporary file for Sort or Index (dBase) 
w4a Audio file 
w64 Sonic Foundry Wave-64 format 
w7a Yamaha Motif ES format 
w7v Yamaha Motif ES voices format 
w7w Yamaha Motif ES waveforms format 
w8v Yamaha Motif ES sample data file  
w??  Yamaha TX16W wave file 
w?? Yamaha SY-series wave file 
wa! GigaStudio/GigaSampler compressed wave file 
WAB Outlook file (Microsoft Outlook, Outlook Express) 
wac Bioware Infinity game engine WAVC sound 
wac Nova Logic game boolean logic commands 
wad Doom wad file 
WAD Large file for Doom game containing video, player level, and other information 
wad Quake engine texture file 
wad Theme Park World game archive  
wag Train Simulator file 
wag Urban Chaos saved game file 
wal Black & White II wall data file 
wal Quake 2 texture image format 
WAL Texture file (Quake 2) 
wap WAVPAC filtered .WAV file output 
WAS Script source code file (Procomm Plus Aspect) 
wav WAVe PCM Sound, standard Windows sound format 
WAV Waveform sound (Microsoft Windows) 
wave WAVe PCM sound file 
wax Audio advanced streaming format  
WAX Compiled script file (Procomm Plus Aspect) 
wb FIFA 2000 file 
WB1 Notebook (QuattroPro for Windows) 
WB2 Spreadsheet (QuattroPro for Windows) 
WB3 Text file (QuattroPro for Windows) 
WBC Image file (Webshots) 
WBF Batch file (Microsoft Windows 9.x) 
WBK Backup file (Microsoft Word for Windows) 
WBL Upload file (Argo Webload II) 
WBR WordBar File (Crick Software) 
wbs Webshots screensaver 
WBT Batch file (WinBatch) 
WBT Wordbar template (Crick Software) 
WBZ WebShots image 
WCD Macro token list file (WordPerfect for Windows) 
WCF Webex Saved Chat File 
WCM Data transmission file (Microsoft Works) 
WCM Macro (WordPerfect fdor Windows) 
WCP Product information description file (WordPerfect for Windows) 
wd archive used in games Earth 2140-2160 
WD1 Word Express file 
WD2 Database file (Info Select) by (Micro Logic) 
WDB Database file (Microsoft Works) 
WDF WebArt data file (database file that can be converted for use in many programs) 
WDG Warftpd remote daemon file 
wdgt Dashboard widget 
WDM Microsoft Visual InterDev98 templates Web Project Items file 
wdr Psion Series 3 printer driver 
wdr Star Wars: Tie Fighter media file 
weap Wolfenstein 3D weapon definition script 
WEB Web document (Corel Zara) 
WEB Web source code file 
WFB Bank file (Maui/Rio/Monterey) (Turtle Beack WaveFront) 
wfb Turtle Beach WaveFront bank format 
WFD Audio waveform (WaveForm Manager Pro) 
WFD Drum set (Maui/Rio/Monterey)(Turtle Beach WaveFront) 
wfd Turtle Beach WaveFront drum set format  
WFL Flowchart file (Winflow) 
WFM Windows form (Virtual dBase) 
WFN Symbol (Corel Draw) 
WFP Program file (Turtle Beach WaveFront)(Maui/Rio/Monterey) 
wfp Turtle Beach WaveFront program format 
WFT Data file (NICOLET (Old Format), see NRF) 
WFX Data file (WinFax) 
WG1 Worksheet (Lotus 1-2-3/G) 
WG2 Worksheet (Lotus 1-2-3 for O/S2) 
WGP Data file (Wild Board Games) 
wgt Worms Armageddon teams file 
WI Wavelet compressed bitmap (Corel) 
WiCSaveGame World in Conflict saved game file 
WID Width table (Ventura Publisher) 
WIF Wavelet image file (see WI) 
wii Nintendo WII raw disk image file 
WIL WinImage file 
WIM Wireless identity module (Used by wireless application protocols) 
WIN Window file (dBase) 
WIN Window file (Microsoft FoxPro) 
WIN Window preference file (Pro/Engineer) 
WIS Script file (Reynolds and Reynolds) (Stores the results of a database query) 
WIZ Page wizard (Microsoft Publisher) 
WIZ Wizard file (Microsoft Word) 
WK1 Spreadsheet (Lotus 1-2-3 v. 1 and 2) 
WK3 Spreadsheet (Lotus 1-2-3 v. 3) 
WK4 Spreadsheet (Lotus 1-2-3 v. 4) 
WKB Document file (WordPerfect for Windows) 
WKE Spreadsheet (Lotus 1-2-3 Educational version) 
WKQ Spreadsheet (Quattro Pro) 
WKS Document (Microsoft Works) 
WKS Spreadsheet (Symphony 1.0) 
WKS Worksheet spreadsheet (Lotus 1-2-3) 
WKS Workspace file (Xlisp) 
wl1 Wolfenstein 3D shareware version file 
wl3 Wolfenstein 3D registered version file 
wl6 Wolfenstein 3D registered version file 
wld LucasArts game file 
WLD REND386/AVRIL file 
wld Serious Sam world file 
wld Settlers II map file 
WLF Upload file (Argo Upload I) 
WLK Graphics file (Virtus Walkthrough) 
WLL Add-In file (Microsoft) 
WMA Audio file in Microsoft Windows Media format (Can be changed to ASF) Siren (Sonic 
wma Windows Media Audio 
WMC Backup files for startup (MathCAD for Windows) 
WMC Macro file (WordPerfect for Windows) 
WMC Text file (WordMARC) 
WMF Metafile (Microsoft Windows) 
wmg SecureDoc encrypted hard drive control file 
wmt WinMount file 
WMV Windows Media Player visual/audio file 
WMZ Windows Media Player skins file 
WN Text file (NeXT WriteNow) 
WNF Outline font description file (CorelDRAW) 
WOA Swap file (Microsoft Windows 3.x) 
woa Windows 3.x swap file 
WOC Organization chart (Microsoft Windows OrgChart) 
WORKFLOW Automator workflow 
wow Grave Composer module file 
WOW Music module (MOD) (Grave Composer) 
wp CorelDraw graphic file 
WP Document file (WordPerfect for Windows) 
WP4 Document (WordPerfect for Windows 4.0) 
WP5 Document (WordPerfect for Windows 5.0) 
WP6 Document (WordPerfect for Windows 6.0) 
WPA Word processor document (ACT!) 
WPD Demo file (WordPerfect for Windows) (ALL) 
WPD Document (WordPerfect for Windows) 
wpd SAW sound processing file 
wpd Windows printer driver 
WPF Document (Enable) 
WPF Fax document (WorldPort) 
WPF Form file (WordPerfect for Windows) 
WPG Graphics file (Microsoft Word for Windows) 
WPG Microsoft Word for Windows vector graphics (DrawPerfect) 
wpg WildTangent PNG file 
WPK Macro (Microsoft Word for Windows) 
wpk Nero Wave Editor file 
WPM Macro (Microsoft Word for Windows) 
WPS MS Works Text Document 
wps Painkiller Overdose game file 
WPS Rockbox Theme 
WPT Template (Microsoft Word for Windows) 
WPW PerfectWorks document (Novell) 
wpx Adobe printer description for Postscript printing 
WQ! Compressed spreadsheet (QuattroPro) 
WQ1 Spreadsheet (QuattroPro/DOS) 
WQ2 Spreadsheet (QuattroPro version 5) 
WR1 Spreadsheet (Symphony 1.1-2) 
WR1 Symphony file (Lotus) 
WRAP MediaForge (XMLAuthor) media content file 
WRD Template (Charisma) 
wrf WebEx recording file 
WRG ReGet document 
WRI Write document (Windows Write) 
Write) 
WRK Project file (CakeWalk Music Audio) 
WRK Spreadsheet (Symphony 1.0) 
WRL Virtual Reality model 
WRP 3D modeling file (Raindrop Geomagic) (Scandata) 
WRP Compressed Amiga archive (WARP) 
WRS Resource file (Microsoft Word for Windows) 
WRZ Another VRML fileject 
ws Microsoft Train Simulator world sound file 
ws Microsoft Train Simulator world sound file 
WS Text file (WordStar) 
WS1 Document (WordStar for Windows version 1) 
WS2 Document (WordStar for Windows version 2) 
WS3 Document (WordStar for Windows version 3) 
WS4 Document (WordStar for Windows version 4) 
WS5 Document (WordStar for Windows version 5) 
WS6 Document (WordStar for Windows version 6) 
WS7 Document (WordStar for Windows version 7) 
wsc Worms Armageddon scheme 
WSD Document (WordStar for Windows 2000) 
wsi Waterslide Island level file 
WSP WorkSpace file (Fortran PowerStation) 
wss Microsoft Windows Sound System file 
wss Operation Flashpoint sound file 
wss Web Screen Saver configuration file 
WST Document (WordStar for Windows) 
WSZ Skin (WinAmp) 
WTA Used by wireless telephony applications 
wtf World of Warcraft text file 
wusiksnd Wusikstation multisampled sound 
wv WavPack lossless compressed audio file 
WV WavPack lossless compressed audio file 
wvc WawPack lossless compressed audio file format correction file 
WVL Wavelet Compressed Bitmap 
WVW Interleaf WorldView format (a PDF format) 
WWB Button bar for document window (WordPerfect for Windows) 
wwf WWF Rant Pakk sound file 
WWK Keyboard layout file (WordPerfect for Windows) 
WWL Add-in file (Microsoft Word) 
WXD Music resource file (Relic Entertainment)(Home World) 
WXP Document file (EXP for Microsoft Windows) 
X AVS image (SDSC Image Tool) 
X DirectX 3D model
X Source code file (Lex) 
X01 Secondary index file (Paradox) 
X02 Secondary index file (Paradox) 
X03 Secondary index file (Paradox) 
X04 Secondary index file (Paradox) 
X05 Secondary index file (Paradox) 
X06 Secondary index file (Paradox) 
X07 Secondary index file (Paradox) 
X08 Secondary index file (Paradox) 
X09 Secondary index file (Paradox) 
x13 Hooligans game archive 
X16 Macromedia Extra (program extension), 16 bit 
X32 Macromedia Extra (program extension), 32 bit 
xa GEAR Image file 
xa Sony PlayStation audio/video file 
xa The Sims extensive audio 
xac SimCity Societies game file 
xad eXotic ADlib sound format 
XAR Corel Xara drawing 
xbe Xbox executable file 
XBM A MIME 'X11" bitmap image 
XCF GIMP document 
XCI XML Configuration Information (Adobe enterprise forms product) 
xcr Warlords Battlecry game file 
xdb HyperCD HyperLOCK file 
XDL XML Schema file 
XDP Label file using Avery DesignerPro Label Design) 
XEF XGenics eManager XML form and data for eManager 
XEM XGenics eManager Metered units / credit definition for forms/file usage in eManager 
xen Activision Guitar Hero 3 data file 
XEP XGenics eManager File packaging / unpacking information for eManager components 
XES XGenics eManager XML definition for UI skins 
XET XGenics eManager XML definition for eManager process 
XEV XGenics eManager File download definition for autoupdate and delivery of new procedures 
xex Xbox 360 executable file 
XEZ XGenics eManager Template package for eManager 
XFD Acu4GL/ACUCOBOL extended file description (from Acucorp) 
xfl xICE Desktop encrypted folder 
XFN Printer font file (Ventura Publisher) 
XFN Printer font file (Xerox) 
xfs eRacer sound file 
xfs Gunbound file 
XFT Printer font file (24 Pin) (ChiWriter) 
XFT XML Forms Template (from Adobe enterprise forms products such as Adobe Forms Designer) 
XFX Fax Document (Various) 
xgs Disk image file 
XHTML eXtensible hypertext markup language 
xi Fastracker 2.0 instrument file 
XI Instrument file (FastTracker II) 
XI Instrument sample file (ScreamTracker) 
XIF Image file (Pagis) 
XIF Image file (Xerox) (same as TIF) 
XIF Image file eXtended (ScanSoft) the file is similar to TIFF and is a (Pagis) native format 
XIF Wang imaging file (Included with Windows 95) 
XLA Add-in file (Microsoft Excel) 
XLA Archive (Xlib) 
xlam Microsoft Excel 2007 XML macro-enabled add-in file 
xlamenx Egis encrypted XLAM (Excel 2007) file  
XLB Datafile (Microsoft Excel) 
XLB Toolbar file (Microsoft Excel) 
XLC Chart file (Microsoft Excel) 
XLD Dialogue file (Microsoft Excel) 
XLK Backup file (Microsoft Excel) 
XLL Add-in file (Microsoft Excel) 
XLL Dynamic link library (Microsoft Excel) 
XLM Macro file (Microsoft Excel) 
XLR Microsoft Works spreadsheet or chart 
XLS Worksheet file (Microsoft Excel) 
xlsb Excel 2007 Binary workbook 
xlsm Excel 2007 XML macro-enabled workbook 
xlsx Excel 2007 XML Workbook 
xlsxenx Egis encrypted Excel Open XML XLSX file  
XLT Template file (Microsoft Excel) 
XLT Translation table (Lotus 1-2-3) 
XLT Translation table (Procomm Plus) 
XLT Translation table (Symphony) 
xltm Excel 2007 XML macro-enabled template 
xltx Excel 2007 XML template 
XLV VBA module (Microsoft Excel) 
XLW Workbook (Microsoft Excel) 
xm FastTracker 2 instrument 
XM Music module (MOD) (Fast Tracker 2) 
xmb Lucas Arts X-Wing Mission briefing file 
xmb Microsoft Age of Empires game data file  
xmd GameJack virtual CD or DVD image file 
xmf CDRWin Virtual CD image file
xmf eXtensible music file  
XMI Compressed midi music (eXtended) 
xmi Miles Sound System extended MIDI files 
XML eXtensible markup language 
xms Microsoft eXtended Memory Specification (XMS) 
xms XMS-Tracker file 
xmz Fasttracker 2 extended module  
XNF Network file (Standard) 
XNK Shortcut file (Microsoft Exchange) 
xof XML Othello game file  
XON Datafile (Axon) 
xp Fasttracker pattern 
xpd PlayStation store PSP license file 
xpk WWE RAW model file 
xpl LcdStudio configuration playlist 
xpl Music file 
XPM X BitMap format 
xpx Dungeons & Dragons core rules 2 with expansion 
XQT Executable file (Waffle) 
XQT Macro file (SuperCalc) 
XR1 Data file (Epic Megagames Xargon) 
XRF Cross-reference file (Generic) 
xrns Extended Renoise song file 
xrs Dig It! game file 
xs Age of Empires 3 Map AI generator 
xsb Sokoban++ level file  
xsb XACT sound bank 
xsf Microsoft Office InfoPath File 
xsm eXtra Simple Music file 
xsm SimCity Societies game file 
xsn Microsoft Office InfoPath file
XSX Schema view layout description file (Microsoft XML Designer) 
xt FastTracker music track 
XTB External translation table (LocoScript) 
XTP Data file (Xtree) 
Xtrieve file 
xwb XACT wave bank 
xwc Starbreeze sound file 
xwc Starbreeze sound file 
XWD X Window Dump format (SDSC Image Tool) 
XWF Works file (Yamaha XG) (MIDI sequencing) 
XWK Keyboard mapping file (Crosstalk) 
XWP Session file (Crosstalk) 
XWP Text file (Xerox Writer) 
XWS Xara Webstyle Graphic 
XX Compressed ASCII archive (XXENCODE) 
XXE Compressed ASCII archive (XXENCODE) 
xxe XXEncoded file 
xxx Unreal Engine 3 game file 
XXX XXXX 
XY Text file (XYWrite) 
XY3 Document file (XYWrite III) 
XY4 Document file (XYWrite IV) 
XYP Document file (XYWrite III Plus) 
XYW Document file (XYWrite for Windows 4.x) 
Y Compressed Amiga archive (YABBA) 
Y Grammar file (Yaac) 
Y01 Secondary index file (Paradox) 
Y02 Secondary index file (Paradox) 
Y03 Secondary index file (Paradox) 
Y04 Secondary index file (Paradox) 
Y05 Secondary index file (Paradox) 
Y06 Secondary index file (Paradox) 
Y07 Secondary index file (Paradox) 
Y08 Secondary index file (Paradox) 
Y09 Secondary index file (Paradox) 
yadpcm Raw Yamaha 4-bit ADPCM format 
YAL Clipart library (Arts and Letters) 
YBK Yearbook file (Microsoft Encarta) 
ycm Yugioh Card Maker file 
ydr Yu-Gi-Oh! Power of Chaos replay file 
YUV Graphics file (YUV) 
YZ Compressed file archive (YAC) 
Z Compressed ASCII archive (COMPRESS) 
Z Unix file Compressed 
z# Frotz Z-code game 
z2f Zoo Tycoon 2 game file 
Z3 Game module (Infocom)
z5 Inform game file 
z6 Inform game file 
z64 Nintendo 64 game ROM 
z8 Inform game file 
za Deadly Dozen game file 
za Elite Warriors game file 
za Line of Sight: Vietnam PC Game related file 
ZAP Compressed file (FileWrangler) 
ZAP Software installation settings file (Microsoft Windows) 
zar Sony PlayStation 2 audio file 
zax Zaxcom audio file  
zbd MechWarrior 3 snow fields file 
zbd Zebedee encrypted file 
zcc ECLIPSE server configuration information file 
ZDG Compressed text document (Zview) 
zds GZDoom save file 
ZER Data file (Zerberus) 
zfs Interstate '76 game archive 
zfs Interstate '82 game archive  
ZGM Graphics file (ZenoGraphics) 
zik Cryo ZIK audio file 
ZIP Zip file Compressed archive 
zipenx Egis encrypted ZIP file
zipfs 18 Wheels of Steel: Across America game file 
zipfs Duke Nukem: Manhattan Project game archive 
zlc AAICWpro/ZoneAlarm Mailsafe renamed .inf file 
zm5 ZSNES Movie #5  
zmap Zombies Ate My Neighbors map file 
zmb ZoneAlarm Mailsafe renamed .DLL file 
zmc ZoneAlarm MailSafe file
zmd ZoneAlarm Mailsafe file 
zme ZoneAlarm Mailsafe file 
zmon ZoundMonitor file 
ZOM Compressed Amiga archive (ZOOM) 
ZOO An early compressed file format 
zoo Zoo Tycoon game file  
zsd Dave Mirra Freestyle BMX data 
zsg Zillions of Games game file 
zst ZSNES save file 
ztd Zoo Tycoon game file
ZVD Voice file (Zyxel Z-Fax) 
zvd Zyxel Voicefile (Z-Fax)
zzb FutureSoft MultiView configurable toolbar 
zzc FutureSoft MultiView connection details 
zzd FutureSoft MultiView wizard defaults 
zze FutureSoft MultiView emulation details 
zzf FutureSoft MultiView file transfer configuration 
zzk FutureSoft MultiView keyboard mapping 
zzp FutureSoft MultiView configurable pop-up menu 
zzt FutureSoft MultiView terminal configuration 
zzu FutureSoft MultiView uninstall file
_dl Dynamic Link Library DLL file form
~$~ Temporary file (1ST Reader) 
~AP AppExpert project database file (Borland C++ 4.5) 
~DE Project backup file (Borland C++ 4.5) 
~MN Menu backup (Norton Commander) 
~PR Project backup file (Terramodel) 