| 191. | .att | Attachment (Lotus Notes) ◊ Bitmap graphics (AT T Group 4) |
| 192. | .atw | Personal data (AnyTime Deluxe for Windows screensaver) |
| 193. | .au | Sound - basic 8bit ulaw compressed audio file (Sun Audio File format) |
| 194. | .aud | Audio file (Westwood Studios games) (Kyrandia 3, C C, RedAlert) |
| 195. | .aut | Automation (IPIX) |
| 196. | .aux | Auxiliary dictionary (ChiWriter) ◊ Auxillary references (TeX/LaTeX) |
| 197. | .ava | Publication (Avagio) |
| 198. | .avatar | Avatar data |
| 199. | .avb | AntiViral Toolkit Pro Bases ◊ Character file (Microsoft Chat) |
| 200. | .ave | Avenue script (ArcView) |
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