| 111. | .ain | Compressed file archive (Ain) ◊ attribute index file (ArcView) |
| 112. | .aio | APL file transfer format file |
| 113. | .aip | Audiosoft Parameter file |
| 114. | .air | Automatic image registration |
| 115. | .ais | Graphics (Array of Intensity Samples) (Xerox) ◊ Image sequence file (ACDSee) ◊ Velvet Studio Instruments |
| 116. | .aix | Datafile for cardfile application (HP NewWave) |
| 117. | .akw | A-Keywords (RoboHELP Help project Index Designer) |
| 118. | .al | Sound (Raw CCITT/ITU G.711 A-law format audio) |
| 119. | .alaw | Sound (Raw CCITT/ITU G.711 A-law format audio) |
| 120. | .alb | Graphics album (JASC Image Commander) |
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