| 31. | .abr | Adobe Brush file (Adobe PhotoShop) |
| 32. | .abs | Abstracts (info file) ◊ Compiler output file on PC platform (gcc) ◊ Data file (Abscissa) ◊ MPEG Audio Sound file |
| 33. | .abw | Document (AbiWord) |
| 34. | .ac$ | Spooled plot file (AutoCAD AutoSpool) |
| 35. | .ac0 | AC/frequence domain output (Spice) |
| 36. | .ac1 | AC/frequence domain output (Spice) |
| 37. | .ac2 | AC/frequence domain output (Spice) |
| 38. | .ac3 | AC/frequence domain output (Spice) |
| 39. | .ac4 | AC/frequence domain output (Spice) |
| 40. | .ac5 | AC/frequence domain output (Spice) |
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