| bom | Cadence OrCAD Bill of Materials Data |
| bom | Liaison Delta Business Object Model |
| bom | Mac OS X Bill of Materials File |
| bom | PTC Creo Bill of Materials File |
| bon | Binary Object Notation Document |
| bonds | Ribbons Bonds Definition |
| bones | XtalView Xfit Ridgelines Data |
| boo | Boo Encoded Data |
| book | BookSmart Book Data |
| book | Budget In Brief Budget Book |
| bookexport | BookSmart Exported Books Data |
| booktemplate | BookSmart Book Template |
| 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 | 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 |
