| .B8 | Open Source | Rasterbildefiler | Bitmap Picture File | IrfanView | Open Source |
| .BFL | XnSoft | Rasterbildefiler | BFLI Image Format | XnView MP | XnSoft |
| .BGB | Beck IPC GmbH | Rasterbildefiler | Beck Graphics Bitmap | GCLIB file converter | Beck IPC GmbH |
| .BIG | Electronic Arts | Rasterbildefiler | Electronic Arts Game Data File | Dragon UnPACKer | Open Source |
| .BITMAP | Various Developers | Rasterbildefiler | Bitmap Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .BL | Unknown Developer | Rasterbildefiler | Binary Linework TIFF Bitmap | XnView MP | XnSoft |
| .BLZ | Nokia | Rasterbildefiler | N-Gage Mobile Video Game File | Nokia PC Suite | Nokia |
| .BM | X.Org Foundation | Rasterbildefiler | X Windows System Bitmap Image | X Window System | X.Org Foundation |
| .BM2 | DynaVox Mayer-Johnson | Rasterbildefiler | Boardmaker Interactive Board File | DynaVox Mayer-Johnson Boardmaker | DynaVox Mayer-Johnson |
| .BMC | Microsoft Corporation | Rasterbildefiler | Bitmap Cache File | Microsoft Windows | Microsoft Corporation |
| .BMF | IMSI/Design, LLC | Rasterbildefiler | FloorPlan File | IMSI TurboCAD Deluxe | Redway3d and others |
| .BMP | Various Developers | Rasterbildefiler | Bitmap Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .BMQ | Acclaim Entertainment | Rasterbildefiler | Re-Volt Mipmap File | Acclaim Entertainment Re-Volt | Probe Entertainment |
| .BMX | Siemens AG | Rasterbildefiler | Siemens Mobile Animations File | Microsoft Windows Picture and Fax Viewer | Microsoft Corporation |
| .BMZ | Valve | Rasterbildefiler | Portal Bonus Map Zip File | Portal 2 | Valve |
| .BOB | Unknown Developer | Rasterbildefiler | BOB Raytracer Bitmap Image | XnView MP | XnSoft |
| .BP | Data Access Worldwide | Rasterbildefiler | DataFlex Business Process Object | DataFlex | Data Access Worldwide |
| .BPG | Open Source | Rasterbildefiler | Better Portable Graphics (BPG) Image | BPG viewer | Open Source |
| .BPT | Corel | Rasterbildefiler | CorelDRAW Bitmap Master Data | CorelDRAW Graphics Suite | Corel |
| .BRK | Dialogic | Rasterbildefiler | Brooktrout Fax Document | Canvas X | ACD Systems |
| .BRN | BrainStorm Software | Rasterbildefiler | BrainStorm Data File | BrainStorm | BrainStorm Software |
| .BRT | DAZ 3D | Rasterbildefiler | Bryce Textures File | DAZ 3D Bryce | DAZ 3D |
| .BRUSH | Xerox | Rasterbildefiler | Xerox Doodle Brush Bitmap Image | Unknown Software | Unknown Developer |
| .BSS | Capcom | Rasterbildefiler | Resident Evil Background Images File | Resident Evil | Capcom |
| .BW | Paul Haeberli | Rasterbildefiler | White & Black SGI Image File | FFmpeg | FFmpeg team |
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