| 131. | .amf | Music (Advanced Module Format) |
| 132. | .amg | Compressed file archive (AMGC) ◊ System image file (Actor) |
| 133. | .ami | Annotation file (Cocreate SolidDesigner) |
| 134. | .ams | Adobe Monitor Setup calibration file (Adobe PhotoShop) ◊ Music (Velvert Studio MOD) |
| 135. | .an | Text file (Sterling Software, Groundworks COOL Business Team Model) |
| 136. | .anc | List of pattern colors (Canon Computer Pattern Maker) |
| 137. | .and | Animation (AniData) |
| 138. | .ani | Animated cursor (Windows 95/NT) ◊ Animation (Presidio - many) |
| 139. | .anm | Animation (Deluxe Paint Animator) |
| 140. | .ann | Help annotations (Windows 3.x) |
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