| 161. | .arf | Automatic Response File |
| 162. | .arh | Archivers definitions file (DN) |
| 163. | .ari | Compressed file archive (ARI) ◊ Sound (Aristotle) |
| 164. | .arj | Compressed file archive (Robert Jung's ARJ) |
| 165. | .ark | ARC archive (CP/M port of ARC file archiver) ◊ Archive (Managing your Money) ◊ Compressed file archive (QUARK) |
| 166. | .arl | AOL 4.0 organizer file |
| 167. | .arp | Aperture file - for other artwork files |
| 168. | .arr | Arrangement (Atari Cubase) ◊ Bitmap graphics (Amber ARR image) |
| 169. | .art | Bitmap graphics (from AOL using Johnson-Grace compression) ◊ Bitmap graphics - black and white clip art (First Publisher Clip Art) ◊ Graphics (Another Ray Tracer - Vort) |
| 170. | .arx | Compressed file archive (ARX) |
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