| Abbreviation | Definition |
|---|---|
| CMU | Bitmap graphics (Carnegie Mellon University (CMU) Window Manager bitmap Formats) |
| CMUWM | Bitmap graphics (Carnegie Mellon University (CMU) Window Manager bitmap Formats) |
| CMV | CorelMove Animation file |
| CMX | CorelDraw Vector graphics |
| CMYK | Bitmap graphics (raw cyan magenta yellow and black bytes) |
| CNC | CNC general program data |
| CNF | Configuration printer setup file |
| CNM | Windows application menu options and setup file |
| CNQ | Shop file (Compuworks Design) |
| CNT | Rational Rose 98 Contents Tab file |
| CNV | Data CoNVersion support file ( Word for Windows) |
| CNV | Temporary file ( WordPerfect for Win) |
| COB | Cobol language source code file |
| COB | Graphics (Caligari trueSpace2 File Format) |
| COD | Boxer/2 Printer code definition file |
| COD | Datafile (Forecast Plus - MS Multiplan - StatPac Gold) |
| COD | dBASE Application Generator Template source file |
| COD | MicroSoft Multiplan Datafile |
| COD | Program compiled CODe |
| COD | Source code in assembler with original C code as comments (MS C) |