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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .00 | Toys for Bob | Game Files | The Ur-Quan Masters Saved Game Slot 0 File | The Ur-Quan Masters | Toys for Bob |
| .0000 | Commodore International | Game Files | VIC-20 Multi Cartridge File | Unknown Software | Unknown Developer |
| .001 | Smith Micro Software | Game Files | Split Archive File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .007 | bhv | Game Files | Winfunktion Mathematik V8.0 Julia Fractal File | WinFunction Mathematics | bhv |
| .01 | Electronic Arts | Game Files | FIFA 2001 User Data | FIFA 2001 | EA Sports |
| .12 | IBM | Game Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .15 | IBM | Game Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .16 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .19 | IBM | Game Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .24 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .256 | Interplay Entertainment | Game Files | Descent 2 Color Palette File | Interplay Descent 2 | Interplay Entertainment |
| .2DA | BioWare | Game Files | BioWare Infinity Game Engine AD&D Rule Set File | Baldur's Gate | BioWare |
| .32X | Sega | Game Files | Sega 32X ROM | Kega Fusion | Steve Snake |
| .34 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .37 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Audio Data | Salt Lake 2002 | Ubisoft |
| .3DI | NovaLogic | Game Files | Delta Force Object Collection Data | Delta Force | NovaLogic |
| .3DO | Open Source | Game Files | FreeDO Phoenix ISO Image | FreeDO | Open Source |
| .3DS | Autodesk, Inc. | Game Files | 3D Studio Scene | MAXON Cinema 4D | MAXON Computer |
| .3DSX | Microsoft Corporation | Game Files | Homebrew Launcher File | Apple Finder | Apple |
| .4 | IBM | Game Files | IBM Voice Type Languages Scripts Data File | Mozilla Firefox | Mozilla |
| .43 | Kabam | Game Files | Fast And The Furious 6: The Game Game Model | Fast and the Furious 6: The Game | Kabam |
| .4W | Lagarto | Game Files | Four Winds Mah Jong Saved Game/Layout | Four Winds Mah Jong | Lagarto |
| .5 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .586 | Unknown Developer | Game Files | Asm586 File | evo-X | Unknown Developer |
| .6 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .68K | Sega | Game Files | SEGA Mega Drive & Genesis Classics ROM File | MAME | Open Source |
| .9 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Salt Lake 2002 | Ubisoft |
| .99_ | Unknown Developer | Game Files | Casino Game File | Unknown Software | Unknown Developer |
| .A52 | Atari Corporation | Game Files | Atari 5200 ROM | MESS | Open Source |
| .AAO | U.S Army | Game Files | America's Army Map File | America's Army | U.S Army |
| .AAS | Adobe Systems Incorporated | Game Files | Adobe Authorware Shocked Packet File | Adobe Authorware | Adobe Systems Incorporated |
| .ABG | Electronic Arts | Game Files | FIFA World Cup Game Data File | FIFA World Cup | Electronic Arts |
| .ABK | Corel | Game Files | Automatic Backup File | Ability Office | Ability Plus Software |
| .ABL | Ubisoft Blue Byte | Game Files | ANNO 2070 Scenario Data | ANNO 2070 | Ubisoft Blue Byte |
| .ABM | Unknown Developer | Game Files | Music Album | Redbana Audition | Redbana |
| .ABO | Pierre Chambart, Jean-Christophe FILLIATRE and Sylvain Le Gall | Game Files | Applix Builder File | Camomile (Library File) | Pierre Chambart, Jean-Christophe FILLIATRE and Sylvain Le Gall |
| .ABZ | Playlogic | Game Files | Alpha Black Zero Game File | Alpha Black Zero | Playlogic |
| .ACD | Sony Creative Software | Game Files | ACID Project File | ACID XPress | Sony |
| .ACF | Valve | Game Files | Steam Application Cache File | Valve Steam | Valve |
| .ACG | Bolide Software | Game Files | Audio Comparer Group File | Audio Comparer | Bolide Software |
| .ACX | Atari Corporation | Game Files | Atari ST Program | Gemulator | Open Source |
| .ADM | Microsoft Corporation | Game Files | Administrative Template File | Microsoft Group Policy Object Editor | Microsoft Corporation |
| .ADT | Swiftpage, Inc. | Game Files | ACT! Document Template | Swiftpage Act | Swiftpage, Inc. |
| .AGE OF EMPIRES / AGE OF MYTHOLOGY GAME FILE | Microsoft Corporation | Game Files | Age Of Empires/Age Of Mythology Game File | Dragon UnPACKer | Open Source |
| .AGE3REC | Microsoft Corporation | Game Files | Age Of Empires 3 Recording | Age of Empires III | Ensemble Studios |
| .AGE3SCN | Microsoft Corporation | Game Files | Age Of Empires 3 Scenario File | Microsoft Age of Empires | Ensemble Studios |
| .AGX | Open Source | Game Files | AGT Game File | AGiliTy | Open Source |
| .AHF | Anadigm | Game Files | AnadigmDesigner ASCII Code | Anadigm Designer 2 | Anadigm |
| .AI | Adobe Systems Incorporated | Game Files | Adobe Illustrator File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AIN | Valve | Game Files | Source Engine Compiled AI Nodegraph File | Valve Source SDK | Valve |
| .AIR | Adobe Systems Incorporated | Game Files | Adobe AIR Installation Package | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .AIV | EllaZ Systems | Game Files | AIVault Data File | AlVault | EllaZ Systems |
| .AIW | Sony | Game Files | Formula One 2001 Game Data | Formula One 2001 | Psygnosis |
| .ALA | Open Source | Game Files | Alan Game File | Alan System | Open Source |
| .ALO | LucasArts Entertainment Company, LLC | Game Files | Star Wars: Empire At War Game File | Star Wars: Empire at War | LucasArts Entertainment Company, LLC |
| .ALR | Campbell Wild | Game Files | ADRIFT Language Resource File | ADRIFT Generator | Campbell Wild |
| .AM1 | Giovanni Albani | Game Files | Adventure Maker Project File | Adventure Maker | Giovanni Albani |
| .AMA | Electronic Arts | Game Files | FIFA 2000 Game Data | FIFA 2000 | Electronic Arts |
| .AMT | Planit Solutions, Inc. | Game Files | Alphacam 3D Mill, 2D Mill Tool | Planit Alphacam | Planit Solutions, Inc. |
| .AR | Microsoft Corporation | Game Files | Midtown Madness Data File | 7-Zip | Igor Pavlov |
| .ARC | Symantec Corporation | Game Files | Norton Backup Archive | Symantec Norton 360 Version 6.0 | Symantec Corporation |
| .ARC.LH | Nintendo | Game Files | Nintendo Archive | Reggie! Level Editor | Treeki And Tempus |
| .ARCH00 | Sierra Entertainment | Game Files | F.E.A.R. Game Archive | F.E.A.R | Sierra Entertainment |
| .ARE | BioWare | Game Files | BioWare Aurora Engine Area File | BioWare Neverwinter Nights | BioWare |
| .ARKPROFILE | Studio WIldcard | Game Files | ARK Game File | Ark: Survival Evolved | Studio WIldcard |
| .ARMY | Microsoft Corporation | Game Files | Impossible Creatures Collection Of Created Creatures File | Impossible Creatures | Microsoft Corporation |
| .ARP | ElcomSoft | Game Files | Advanced RAR Password Recovery Setup | Advanced Archive Password Recovery | ElcomSoft |
| .ARS | Adobe Systems Incorporated | Game Files | After Effects Render Settings File | Adobe After Effects | Adobe Systems Incorporated |
| .ART | Autodesk, Inc. | Game Files | ArtCAM Model | ArtCAM | Autodesk, Inc. |
| .ASG | Krisalis Software Limited | Game Files | Airport Tycoon Saved Game File | Airport Tycoon | Krisalis Software Limited |
| .ASH | Nintendo | Game Files | Nintendo Wii System Menu File | Easy CSM | Open Source |
| .ASS | Ubisoft | Game Files | Splinter Cell Blacklist Game Data File | Splinter Cell Blacklist | Ubisoft |
| .ATLAS | Firefly Studios | Game Files | Stronghold 3 Editor Data | Stronghold | Firefly Studios |
| .ATM | E-on Software, Inc. | Game Files | Vue Atmospheres File | E-on Vue | E-on Software, Inc. |
| .AUR | Andrew Gryc | Game Files | AutoREALM Map | AutoREALM | SourceForge |
| .AZP | Atomic Games | Game Files | Close Combat Effect Data | Close Combat | Atomic Games |
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | Grand Theft Auto III | Rockstar Games |
| .B1 | The Catalina Group | Game Files | B1 Compressed Archive | B1 Free Archiver | The Catalina Group |
| .B2K | Sensible Software | Game Files | Sensible Soccer 2006 Data | Sensible Soccer | Sensible Software |
| .BAF | BioWare | Game Files | BioWare Infinity Game Engine Script | Baldur's Gate | BioWare |
| .BAH | BioWare | Game Files | BioWare Infinity Game Engine Data | Baldur's Gate | BioWare |
| .BAM | Broad Institute | Game Files | Bob's Adlib Music File Format | Nullsoft Winamp | Nullsoft |
| .BANK | Red Hook Studios | Game Files | Darkest Dungeon Sound Data | Darkest Dungeon | Red Hook Studios |
| .BAR | BlackBerry | Game Files | BlackBerry OS 10 Application Installation Package | Blackberry 10 | BlackBerry |
| .BBG | CyberSports Ltd | Game Files | CyberSports For Basketball Game File | CyberSports for Basketball | CyberSports Ltd |
| .BBRKPUZZLE | Juan Trujillo / JTTSoft | Game Files | BrainsBreaker Puzzle Data File | BrainsBreaker | Juan Trujillo / JTTSoft |
| .BBZ | BitBlaze | Game Files | Bitblaze Audio File | Unknown Software | Unknown Developer |
| .BCS | The Wavelength | Game Files | Batch Compiler Specification File | Batch Compiler | The Wavelength |
| .BD1 | Unknown Developer | Game Files | X Operations Map Block Location | X Operations | Unknown Developer |
| .BDF | Willowsoft Creek Software | Game Files | Backup Definition File | Backup Made Simple | Willowsoft Creek Software |
| .BDP | Microsoft Corporation | Game Files | Exchange Diagnostic Message | Microsoft Exchange Server | Microsoft Corporation |
| .BEJEWELED2DELUXESAVEDGAME | Big Fish Games, Inc | Game Files | Bejeweled 2 Deluxe Saved Game | Bejeweled 2 Deluxe | PopCap Games |
| .BEX | Symantec Corporation | Game Files | PGP Binary Extracted Public Key | Pretty Good Privacy (PGP) | Symantec Corporation |
| .BF | Cryo Interactive Entertainment | Game Files | CryoBF Game Data File | XpoZed's Unpakke | nullsecurity organization |
| .BFB | Microsoft Corporation | Game Files | Zoo Tycoon 2 Model File | Zoo Tycoon 2 | Microsoft Corporation |
| .BFG | Big Fish Games, Inc | Game Files | Big Fish Games Application File | Big Fish Games Game Manager | Big Fish Games, Inc |
| .BFL | XnSoft | Game Files | BFLI Image Format | XnView MP | XnSoft |
| .BFM | Terminal Reality | Game Files | Terminal Reality Model File | BloodRayne | Terminal Reality |
| .BFS | Bugbear Entertainment | Game Files | FlatOut Game Data File | FlatOut | Bugbear Entertainment |
| .BGL | Babylon Software Ltd. | Game Files | Babylon Glossary File | Babylon | Babylon Software Ltd. |
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