| 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 |
| 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 |
| ash | KoLmafia ASH Script |
| asset | Unity Asset |
| assets | StuntMANIA Assets Data |
| asstrm | Splinter Cell: Blacklist Data |
| ast | Need for Speed: Underground Audio Data |
| atc | SimCity 4 Animation Texture Collection |
| avp | SimCity 4 Animation Viewpoints Data |
| awf | Abomination Game Data |
| awreplay | Arena Wars Replay |
| az | Ski Stunt Simulator Animation |
| b!k | Microsoft Flight Simulator Scenery Data |
| b2k | Sensible Soccer 2006 Data |
| b3d | OpenBVE 3D Object Data |
| ba0 | B.O.U.T. Evolution Texture Data |
| ba2 | Bethesda Softworks Archive |
| baa | Twilight Princess Audio Archive |
| baf | Battlefield 2 Animation |
