| bln | Golden Software Blanking |
| blo | IBM DB2 Binary Large Object Data |
| blob | IBM DB2 Binary Large Object Data |
| blob | Valve Steam Client Registry Data |
| blob | WOW! Diagnostic BLOB Data |
| blockplt | Lego Mindstorms NXT Block Palette Data |
| blow5 | SLOW5 Binary Data |
| blr | Biacore BIAlite Project Data |
| blrb | Apple Extensions Manager Info Data |
| bls | Brush Lettering Saved Brush Style |
| blt | AOL Instant Messenger Buddy List |
| bluebutton | VA Blue Button Data |
| bluestacks | BlueStacks App Player Data |
| blw | Adobe Photoshop Black and White Presets Data |
| blwd | Claris Home Page Data |
| blx | Magellan Mapsend Map Data |
| blz | Crossword Power Tools Crossword Library |
| blz | TeamViewer Blizz Recorded Session |
| blz | TeamViewer Blizz Session Data |
| bm2 | Boardmaker Board |
| bm3 | Sony Ericsson PC Suite Backup |
| bmap | Block Map File |
| bmb | CHESSBD/SLICS Bounding Box Data |
| bmb | 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 |
| bmi | Blaise Metafile |
| bmk | BillMinder Backup Data |
| bmk | WindLDR Bookmarks File |
| bmk | Windows Help Bookmark |
| bml | Blaise Mode Library |
