| 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 |
| 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 |
| calb | Coolect Album |
| cat | Microsoft Windows Security Catalog |
| cb | Microsoft Windows 95 Clean Boot File |
| cbds | Comic Book DS |
| cbplugin | Code::Blocks Plugin |
| cbs | Comodo Backup Job Script |
| cdl | Maxon Cinema 4D Plugin |
