| bnhq | BinHex Encoded Archive |
| boa | BOA Constrictor Compressed Archive |
| boxer | Boxer for Mac Game Archive |
| boz | BZIP Over ZIP Compressed Archive |
| bqy | Shrinkit NuFX Archive with BLU Header |
| br1 | Total Commander Cached Button Bar Icons |
| br2 | Total Commander Cached Button Bar Icons |
| brainzip | Personal Brain v6 BrainZip Archive |
| btc | Becker Tools Compressed Archive |
| btinstall | uTorrent Install Package |
| bu | SAP Business One BackUp Data |
| bulk | BulkZip Compressed Archive |
| bundle | Git Bundle Archive |
| bxpck | BoxedApp Package |
| bxy | Shrinkit NuFX Archive with Binary II Header |
| bz | BZip Compressed Data |
| bz2 | BZip2 Compressed Data |
| bza | IZArc BGA Archive |
| bzip | BZip Compressed Data |
| bzip2 | BZip2 Compressed Data |
| bzp | ProSystem fx Engagement Binder Backup Package |
| c00 | WinAce Archive |
| c000 | Genie Backup Manager Compressed Split Backup Archive |
| c01 | WinAce Archive |
| c02 | WinAce Archive |
| c03 | WinAce Archive |
| c04 | WinAce Archive |
| c05 | WinAce Archive |
| c06 | WinAce Archive |
| c07 | WinAce Archive |
| c08 | WinAce Archive |
| c09 | WinAce Archive |
| c10 | WinAce Archive |
| caa | CleanApp Archive |
| cab | Microsoft Cabinet File |