| 51. | .ccf | Communications configuration file (Symphony) ◊ Configuration file (OS/2 Multimedia Viewer) |
| 52. | .cch | Chart (CorelChart) ◊ Image chip file (PhotoModeler) |
| 53. | .cci | CCITT Group 3 and Group 4 Encoding |
| 54. | .ccl | Communication Command Language file (Intalk) |
| 55. | .ccm | Mailbox (Lotus CC:Mail) |
| 56. | .cco | Data (CyberChat) ◊ Graphics (XBTX format) |
| 57. | .ccrf | Bitmap graphics (Calcomp Raster File) (B W or 1bit CMYK for printers) ◊ Bitmap graphics (Calcomp Raster File) (black and white or 4bit CMYK) |
| 58. | .cct | Shockwave cast (Macromedia Director) |
| 59. | .ccx | Graphics (Corel Photo House) |
| 60. | CCITT | Comité Consultatif International de Telegraphie et Telephonie See also: Comité Consultatif International de Telegraphie et Telephonie |
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