| 21. | .aam | Shocked file (Authorware) |
| 22. | .aas | Shocked packet (Authorware) |
| 23. | .ab | Applix Builder file |
| 24. | .ab6 | Datafile (ABStat) |
| 25. | .ab8 | Datafile (ABStat) |
| 26. | .abc | Musical notation language file (folk melodies) ◊ Document (ABC FlowCharter 1.0) ◊ General filename extension (ABC programming language) |
| 27. | .abf | Adobe Binary Screen Font (Adobe Software) |
| 28. | .abk | Automatic backup (CorelDraw, PrintMaster Gold) ◊ Avigo Backup (Avigo) |
| 29. | .abm | Album (Image PALS, PhotoPlus) ◊ Music album (HitPlayer) |
| 30. | .abo | Applix Builder Turbo file |
Top 10 
Feedback