| 11. | .ac9 | AC/frequence domain output (Spice) |
| 12. | .aca | Animation (Microsoft Agent) ◊ Project (Project Manager Workbench) |
| 13. | .acad | AutoCAD database file |
| 14. | .acb | Compressed file archive (ACB) ◊ Graphics (ACMB) |
| 15. | .acc | Document (Accent Duo 2.0) ◊ Program (DR-DOS - ViewMax) (GEM / resident) |
| 16. | .acd | Character definition file (Microsoft Agent) |
| 17. | .ace | Compressed file archive (ACE, WinACE) |
| 18. | .acf | Adobe Custom Filter (Adobe PhotoShop) ◊ HTTP character file (Microsoft Agent) |
| 19. | .acgi | ACGI Script (WWW) |
| 20. | .aci | ACI development appraisal (ACIWEB) |
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