| 1. | .as | Applix Spreadsheet ◊ Music (AudioSoft) |
| 2. | .asa | Data (Microsoft Visual InterDev) |
| 3. | .asc | Ascii text ◊ Bitmap graphics - black and white (HP-48sx GROB Graphic Object) ◊ PGP Armored Encrypted File (Pretty Good Privacy) |
| 4. | .ascii | Text graphics (ASCII text characters file) |
| 5. | .asd | Advanced Streaming format (ASF) Description file ◊ Autosave file (Word for Windows) ◊ Presentation (Astound) ◊ Screen driver (Lotus 1-2-3) |
| 6. | .ase | Sample (Velvet Studio) |
| 7. | .asf | Active Streaming Format file (video animation) ◊ Datafile (STATGRAPHICS) ◊ Screen font (Lotus 1-2-3) |
| 8. | .ash | Assembly language header file (TASM 3.0) |
| 9. | .asi | Assembler include file (Turbo C - Borland C++) |
| 10. | .asic | ASIC language source code file (ASIC) |
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