| 1. | .ai | Vector graphics (Adobe Illustrator) |
| 2. | .aif | Application information file (EPOC) ◊ Setup information (ADW Knowledge Ware) ◊ Sound (AIFF Audio Interchange File Format) |
| 3. | .aifc | Sound (Audio Interchange File Format with Compression) |
| 4. | .aiff | Sound (AIFF Audio Interchange File Format) |
| 5. | .aih | attribute index file (ArcView) |
| 6. | .aim | AOL Instant Message Launch ◊ Asm Text Mode Image File (The Ultimate Draw) |
| 7. | .ain | Compressed file archive (Ain) ◊ attribute index file (ArcView) |
| 8. | .aio | APL file transfer format file |
| 9. | .aip | Audiosoft Parameter file |
| 10. | .air | Automatic image registration |
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