| anim | Homeworld Animation Data |
| animated | OpenBVE Animated Object |
| anl | Train Model Simulator Track Layout |
| anm | Infinity Engine Equation Script |
| anm | Jazz Jackrabbit 2 Animation Data |
| anm | Men of War: Assault Squad 2 Animation Data |
| ant | SimAnt for Windows Saved Game |
| anz | KISS CM3D Model |
| apc | Cryo APC Audio |
| apk | Train Simulator Packaged Activity Data |
| 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 |
| arf | PacMania 2 Game Archive |
| arh | El Airplane Game Archive |
| ark | ARK: Survival Evolved World Data |
| arkprofile | ARK: Survival Evolved Player Profile Data |
| arktribe | ARK: Survival Evolved Tribe Data |
| arlc | Commandos 2: Men of Courage Game Data |
| arm | Fly! Articulated Model Data |
| arm | Vagrant Story Minimap Data |
| arma2profile | ARMA 2 Profile Data |
| army | Impossible Creatures Game Data |
| ars | Carmageddon Saved Game |
| artdef | Civilization 6 Game Data |
