| bnbk | BioNumerics Database Backup |
| bnd | hyperMILL CAM Boundary Data |
| bnd | Typequick BND Data |
| bnf | Backus-Naur Form File |
| bng | The Bingo Maker Template |
| bnk | Guitar Rig Preset Bank |
| bnk | Spotify Playlist Data |
| bnl | MicroSim PCBoard Netlist |
| bnn | FLUKA Binary Data |
| bnr | Nintendo Wii Banner Data |
| bnr | OS/2 MultiDesk Banner |
| bnskin | BeatNik Clock Skin |
| bntx | Switch Binary NX Texture Data |
| bnv | Autodesk Simulation Mechanical Binary Restart Data |
| bnvib | Switch Binary NX Vibration Data |
| bnw | Bayesian Network Web Server Data |
| bnz | The Bingo Maker Card Template |
| bobj | Blender Fluid Simulation Object |
| boe | Microsoft Outlook Express Backup Database |
| bof | Altair FEKO POSTFEKO Binary Output Data |
| bof | Babylon License Data |
| bog | PVVMUD Binary Object Geometry File |
| boi | Botje Bot Data |
| bok | Drudix Photobook Definition Data |
| bok | Pearson TestGen Test Bank |
| bolts | Tekla Structures Exported Bolts Data |
| 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 |
| boo | IBM BookManager Book Data |
