| 21. | .acl | Keyboard accelerator (Corel Draw 6) |
| 22. | .acm | Audio Compression Module add-on (Windows) ◊ Compressed sound file (Fallout 1.2, Baulder's Gate) ◊ Graphics file (ACMB format) ◊ Windows system directory file |
| 23. | .acmb | Graphics file (ACMB format) |
| 24. | .aco | Adobe Color Palette (Adobe PhotoShop) |
| 25. | .acp | Assistant preview file (Microsoft Office) ◊ Compressed file archive (ACB) |
| 26. | .acr | Bitmap graphics (American Collage of Radiology medical image ACR-NEMA format) |
| 27. | .acs | Character structered storage file (Microsoft Agent) |
| 28. | .act | Actor file (Microsoft Office Assistant) ◊ Actor source code file (Graphics cell) (Animation Works) ◊ Color table (Adobe Photoshop) ◊ Foxdoc Action Diagrams (FoxPro) ◊ Presentat… 0.2 KB |
| 29. | .acu | Machine independent COBOL object (ACUCOBOL-GT) |
| 30. | .acv | Compress and decompress audio data (OS/2 driver) |
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