| bmdx | eXtendable Wad Editor BMDX Data |
| bmi | Blaise Metafile |
| bmk | WindLDR Bookmarks File |
| bmk | Windows Help Bookmark |
| bml | Blaise Mode Library |
| bmml | Balsamiq Mockups Markup Language File |
| bmp | BPM Studio Skin Bitmap |
| bmpenx | Egis Encrypted BMP Data |
| bmpskin | Blaze Media Pro Skin |
| bmpx | Egis Encrypted BMP Data |
| bmr | Sybase PowerDesigner Multimodel Report Backup |
| bmrb | BMRB Chemical Shift List |
| bmrl | Balsamiq Mockups Data |
| bmsh | Edge Mesh Data |
| bmsk | STK Body Mask File |
| bn7 | OxMetrics Binary Data |
| bnb | Backnine Bookie Data |
| bnbk | BioNumerics Database Backup |
| bnd | hyperMILL CAM Boundary Data |
| bnf | Backus-Naur Form File |
| bng | The Bingo Maker Template |
| bnk | Guitar Rig Preset Bank |
| bnl | MicroSim PCBoard Netlist |
| bnn | FLUKA Binary Data |
| bnr | OS/2 MultiDesk Banner |
| bnskin | BeatNik Clock Skin |
| bntx | Switch Binary NX Texture 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 |
| bok | Pearson TestGen Test Bank |
