| bl7 | Ruckus ZoneFlex Firmware Update |
| blg | Windows Binary Performance Log |
| blj | Sagem Fast 3202 Firmware |
| blr | Sagem Fast 3202 Firmware |
| bms | Binary MultiEx Script |
| bnc | Bojanov Encryptor File |
| bnd | DB2 CLI Bind File |
| bootskin | Stardock Bootskin |
| bpkey | Blender Publisher License Key |
| bpz | Easy Blue Print Symbol Library |
| bra | SAP BRARCHIVE Lock File |
| bri | Bryce Plug-in |
| brm | Bryce Plug-in |
| bsuf | SolarEdge Inverter Firmware |
| bsz | BSPlayer Skin File |
| bt! | BitSpirit Incomplete Download |
| btkey | uTorrent License Key |
| btoa | Binary-to-ASCII Encoded File |
| btwsendto | Windows Bluetooth Transfer Options Data |
| buf | Buffer |
| buj | Personal Backup Saved Task |
| bup | DVD Information Backup |
| bvd | Bitdefender Vault File |
| bzi | DBAN Kernel Image |
| bzplug | Corel AfterShot Pro Plugin Bundle |
| bzs | BlueZone Script |
| c2a | Casio ClassPad II Add-in |
| c2u | Texas Instruments CBL 2 OS File |
| c32 | Syslinux COM32 Module |
| cache | General Cache File |
