| ajart | Animal Jam Artwork Data |
| ajgart | Animal Jam Artwork Data |
| alo | Star Wars: Empire at War Game Model |
| am1 | Adventure Maker Package |
| ama | FIFA 2000 Game Data |
| amx | AMX Mod Plugin |
| an2 | Croc Animation |
| ancs | Metroid Prime Animation Data |
| animated | OpenBVE Animated Object |
| anz | KISS CM3D Model |
| apc | Cryo APC Audio |
| ar | Midtown Madness 2 Game Data |
| arch00 | F.E.A.R. Game Archive |
| arch01 | F.E.A.R. Game Archive |
| arch05 | Middle Earth: Shadow of Mordor Game Data |
| archcfg | F.E.A.R. 2: Project Origin Configuration |
| archive | Unreal Tournament Localization Data |
| are | Infinity Engine Area Contents |
| arena | Quake 3 Arena Game Data |
| arkprofile | ARK: Survival Evolved Player Profile Data |
| arlc | Commandos 2: Men of Courage Game Data |
| arm | Vagrant Story Minimap Data |
| army | Impossible Creatures Game Data |
| artdef | Civilization 6 Game Data |
| asb | Starpoint Gemini 2 Assembly |
| asg | Airport Tycoon Saved Game |
| ash | KoLmafia ASH Script |
| asset | Unity Asset |
| assets | StuntMANIA Assets Data |
| asstrm | Splinter Cell: Blacklist Data |
