| blz | TeamViewer Blizz Recorded Session |
| TeamViewer Blizz Session Data |
| bm2 | Boardmaker Board |
| bm3 | Sony Ericsson PC Suite Backup |
| bmap | Block Map File |
| bmb | CHESSBD/SLICS Bounding Box Data |
| Onyx BAMBOO Modeler Data |
| bmc | Microsoft Windows Terminal Server Client Bitmap Cache |
| bmd | Gamecube BDL Model Data |
| bmd5 | BookmarkingDaemon Data |
| bmdx | eXtendable Wad Editor BMDX Data |
| bmf | Turbo FloorPlan 3D BMF Data |
| bmi | Autodesk 3D Studio Max BMI Plugin |
| Blaise Metafile |
| bmk | BillMinder Backup Data |
| CyberLink PowerDVD DVD Bookmark Data |
| WindLDR Bookmarks File |
| Windows Help Bookmark |
| bml | Blaise Mode Library |
| bmm | Pixia Palette Data |
| 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 |
| bms | Backup Magic Backup Set |
| BeMusic Script |
| BIOWRAP Multi-Layer Security Data |
| bmsh | Edge Mesh Data |
| bmsk | STK Body Mask File |
| bn2 | Bojanov Encryptor Encrypted File |
| bn7 | OxMetrics Binary Data |
| bnb | Backnine Bookie Data |
| bnbk | BioNumerics Database Backup |
| bnd | hyperMILL CAM Boundary Data |
| Typequick BND Data |
| bnf | Backus-Naur Form File |
| bng | The Bingo Maker Template |
| bnk | Guitar Rig Preset Bank |
| Spotify Playlist Data |
| bnl | MicroSim PCBoard Netlist |
| bnn | FLUKA Binary Data |
| bnr | Nintendo Wii Banner Data |
| 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 |
| bnx | Board Neutral Exchange 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 |
| Babylon License Data |
| bog | PVVMUD Binary Object Geometry File |
| boi | Botje Bot Data |
| bok | Drudix Photobook Definition Data |
| Pearson TestGen Test Bank |
| bolts | Tekla Structures Exported Bolts Data |
| bom | Cadence OrCAD Bill of Materials Data |
| Liaison Delta Business Object Model |
| Mac OS X Bill of Materials File |
| PTC Creo Bill of Materials File |
| bon | Binary Object Notation Document |
| bonds | Ribbons Bonds Definition |
| bone | Bones 3D Model |
| bones | XtalView Xfit Ridgelines Data |
| boo | Boo Encoded Data |
| IBM BookManager Book Data |
| book | BookSmart Book Data |
| 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 |
