| an2 | Croc Animation |
| ancs | Metroid Prime Animation Data |
| ani | Painkiller Overdose Game Animation |
| ani | Transport Fever Game Animation Data |
| 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 |
| 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 |
| 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 |
| army | Impossible Creatures Game Data |
| artdef | Civilization 6 Game Data |
| asb | Starpoint Gemini 2 Assembly |
| asg | Airport Tycoon Saved Game |
