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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software 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 |
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