| bwc | BeadWizard Color Palette |
| bweb | Bacula-Web Data |
| bwm | Blaise Cati Menu Definition |
| bwr | Kermit Beware Data |
| bws | Website X5 Project Backup |
| bwu | BlindWrite CD Copier Data |
| bwv | Business Wave Data |
| bxa | LogiBlox Signal Aliasing Information Data |
| bxd | Broken X Disk Manager Database |
| bxf | iPed Breeder eXchange Format Data |
| bxi | Blaise Datamodel Properties |
| bxml | Bean XML Data |
| bxs | BioExplorer Session Data |
| bxw | Pedigree Central Database Index |
| by | PSpice Data |
| byt | MATLAB MAT5 Format Data |
| bz1 | WinTOTAL Automatic Backup Data |
| bzf | Tobii Dynavox Compass User Data |
| bzx | SIR 4000 Quick3D Grid Assembly Data |
| bzz | BuzzBundle Settings Data |
| c1 | POV-Ray Include File |
| c10 | IRIG 106 Original Recording Data |
| c11 | CARE-S InfoWorks User Defined Pollutant Detail Data |
| c18 | Catia V4 Sequential Data |
| c1b | Digital Tachograph Data |
| c1s | Capture One Photo Cache Data |
| c1w | Capture One Work Data |
| c2 | POV-Ray Include File |
| c21 | CARE-S InfoWorks Defined Pollutant Detail Data |
| c2db | Intergraph CAESAR II Input Database |
| c2e | NJStar Chinese WP Dictionary Index |
| c2k | Microsoft Project Holidays Data |
| c2l | WinOnCD Data |
| c2m | Mercury C2M Data |
| c2o | Titan Capture Visualiser Data |