| Abbreviation | Definition |
|---|---|
| BVH | Biovision Hierarchy motion file |
| BW | Bitmap graphics (black and white) (atari - mac) |
| BW | Bitmap graphics (SGI image) |
| BWB | Spreadsheet application (Visual Baler) |
| BWR | Beware - Kermit buglist file |
| BYU | Bitmap graphics (Movie BYU format) |
| BZ | Compressed file archive (bzip) |
| BZ2 | Compressed file archive (bzip2) |
| C | C language source code file |
| C++ | C++ language source code file |
| C00 | Ventura Publisher Print file |
| C3E | Cype file |
| C4 | 1bit JEDMICS CCITT Group 4 format Bitmap graphics |
| C64 | Commodore 64 image file Bitmap graphics |
| C86 | C language source code file (Computer Innovation C86) |
| CA | Initial cache data for root domain servers (Telnet) |
| CA0 | Packed and splitted file (Borland Installer) |
| CA7 | Beta 44 Job file |
| CAB | Compressed Cabinet file (Microsoft) |
| CAC | dBASE IV executable when caching on/ off |