| b6l | BlindWrite License Data |
| b8 | Cubicomp PictureMaker Blue Channel Image Data |
| b84 | TI-84 Plus CE Bundle Image |
| ba1 | Windows Media Center Report Log |
| ba6 | TaxACT 2016 Tax Return Backup Data |
| ba7 | TaxACT 2017 Tax Return Backup Data |
| bab | Babble Data |
| babl | DeBabelizer Pro Data |
| bac | Avantrix Backup Plus Backup Data |
| back | RMCProfile Coefficient Data |
| backpack | Mammoet Backpack Word List |
| backupdb | Time Machine Backup Folder |
| bad | Brutus Application Definition |
| bad | Microsoft Exchange Non-Delivery Report Message |
| badongo | Badongo File Info |
| bafl | BurnAware File List |
| bag | PMMail Mail Index |
| baggage | InstallAware Setup Dialog Baggage |
| bai | Bank Administration Institute Data File |
| bai2 | Bank Administration Institute Version 2 Data |
| bam | SpliceV BAM Data |
| bap | Blaze Audio Wave Information |
| bap | Visage Mpeg-4 ASCII Body Animation Parameters File |
| baroc | IBM Tivoli Enterprise Console Adapter Description |
| bartco | Bartco VMS Message Data |
| bas | ALEID2000 Basic Data |
| bas | MODFLOW Basic Package |
| base | BioArray Software Environment Data |
| base64 | Base64 Encoded Data |
| bash_history | Bash History Data |
| bass | Tekla Structures Bolt Assembly Data |
| battle | Robocode Battle Data |
| bav | The Bat! Anti-Virus Plugin |
| baw | BrainLED AlfaWave Session |
| bbd | Xilinx Black Box Definition |