| blz | BriefLZ Compressed Data |
| bma | BMA Archiver Compressed Archive |
| bm_ | Compressed Microsoft BMP Image |
| bnh | BinHex Encoded Archive |
| bnhq | BinHex Encoded Archive |
| bny | Binary II Data |
| boa | BOA Constrictor Compressed Archive |
| boxer | Boxer for Mac Game Archive |
| boz | BZIP Over ZIP Compressed Archive |
| bqy | Binary II Data |
| 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 |
| brainzip | PersonalBrain Mind Map Archive |
| bsc | BINSCII Archive |
| bsq | BINSCII Archive |
| btc | Becker Tools Compressed Archive |
| btinstall | uTorrent Install Package |
| bu | SAP Business One BackUp Data |
| bulk | BulkZip Compressed Archive |
| bulk-001 | BulkZip Splitted Archive |
| bulk-002 | BulkZip Splitted Archive |
| bulk-003 | BulkZip Splitted Archive |
| bulk-004 | BulkZip Splitted Archive |
| bulk-005 | BulkZip Splitted Archive |
| bundle | Git Bundle Archive |
| bxpck | BoxedApp Package |
| bxy | Shrinkit NuFX Archive with Binary II Header |
| bz | BZip Compressed Data |
