| book | BookSmart Book Data |
| book | Budget In Brief Budget Book |
| bookexport | BookSmart Exported Books Data |
| booktemplate | BookSmart Book Template |
| bootmgr | Microsoft Windows Boot Manager Data |
| bootscreen | BootSkin Boot Screen |
| bootskin | Stardock BootSkin Data |
| boottrees | IQ-TREE Boot Trees Data |
| bop | Vflo Model Data |
| bopx | Vflo Model Data |
| bos | Dynamite VSP Building Object Style Data |
| bov | VisIt BOV File |
| bow | Back Orifice 2K Workspace |
| box | CARA Loudspeaker Design |
| box | FoxMail Mailbox Data |
| box | ICQ 6 BoxelyToolkit Data |
| box | Kodicom Video Metadata |
| box | MediaShout Presentation Script |
| box | Microsoft SMS Temporary Holding Area Data |
| box | VTrain Box Data |
| boxr | Boxerjam Data |
| bp | BankPerfect Account Data |
| bp | DataFlex Business Process Object |
| bp2 | Autodesk AutoCAD Batch Plot File |
| bp3 | Autodesk AutoCAD Batch Plot File |
| bpa | StorageSync Backup Archive |
| bpb | Sybase PowerDesigner Business Process Model Backup |
| bpc | BuildProfessional Client Data |
| bpd | BizInt Smart Charts for Patents Data Transfer Format Data |
| bpd | Business Plan Pro Plan |
| bpd | PostScript Binary Printer Description |
| bpdx | Business Plan Pro Plan |
| bpf | BatchPhoto Profile Data |
| bpf | Business Plan Pro Formula |
| bpf | F-Secure Base Policy File |
