| 11. | .cmm | Cmm script (CEnvi) |
| 12. | .cmp | Bitmap graphics (Lead CMP compression) ◊ Calibration map (Photofinish) ◊ Compressed data (PKWare compression library) ◊ Customized menu for Netscape or Microsoft Internet Explorer (C… 0.5 KB |
| 13. | .cmr | Movie (MediaPlayer) |
| 14. | .cmrt | Data (CraftMan) |
| 15. | .cmu | Bitmap graphics (Carnegie Mellon University (CMU) Window Manager bitmap format) |
| 16. | .cmuwm | Bitmap graphics (Carnegie Mellon University (CMU) Window Manager bitmap format) |
| 17. | .cmv | Animation (CorelMove - CorelDraw 4.0) |
| 18. | .cmx | Vector graphics (Corel Presentation Exchange format) (CorelDraw) |
| 19. | .cmyk | Bitmap graphics (Raw cyan, magenta, yellow and black bytes) |
| 20. | CMC | Computer Mediated Communication See also: Computer Mediated Communication |
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