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