| 1. | .ab | Applix Builder file |
| 2. | .ab6 | Datafile (ABStat) |
| 3. | .ab8 | Datafile (ABStat) |
| 4. | .abc | Musical notation language file (folk melodies) ◊ Document (ABC FlowCharter 1.0) ◊ General filename extension (ABC programming language) |
| 5. | .abf | Adobe Binary Screen Font (Adobe Software) |
| 6. | .abk | Automatic backup (CorelDraw, PrintMaster Gold) ◊ Avigo Backup (Avigo) |
| 7. | .abm | Album (Image PALS, PhotoPlus) ◊ Music album (HitPlayer) |
| 8. | .abo | Applix Builder Turbo file |
| 9. | .abr | Adobe Brush file (Adobe PhotoShop) |
| 10. | .abs | Abstracts (info file) ◊ Compiler output file on PC platform (gcc) ◊ Data file (Abscissa) ◊ MPEG Audio Sound file |
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