| b&w | ImageLab Image |
| b16 | PCO Camera Image |
| bay | Casio RAW Image |
| bb0 | BBC Micro Mode 0 Bitmap |
| bb1 | BBC Micro Mode 1 Bitmap |
| bb2 | BBC Micro Mode 2 Bitmap |
| bb4 | BBC Micro Mode 4 Bitmap |
| bb5 | BBC Micro Mode 5 Bitmap |
| bbg | BBC Micro LdPic Bitmap |
| bcres | Nintendo 3DS Animation Data |
| beam | Commodore Amiga Multi-palette Image |
| bef | Unified Color HDR Image |
| bfl | BFLI Image |
| bfli | BFLI Image |
| bfx | Bitware Fax Image |
| bga | OS/2 Bitmap Graphic Array |
| bgb | Beck Graphics Bitmap |
| bgp | Bugbiter APAC239i Bitmap Image |
| bgra | Nordlicht BGRA Output |
| bie | JBIG Bitmap Image |
| big | Cartes Michelin Image |
| bil | ArcInfo Band Interleaved by Line Image |
| bin | C64 Printfox/Pagefox Bitmap Image |
| bip | ArcInfo Band Interleaved by Line Image |
| bitmap | X Bitmap Image |
| bkd | BlackInk Drawing |
| bkg | Atari 8-bit Movie Maker Background Image |
| bkw | FontEdit FontSet Image |
| bl | Binary Linework TIFF Image |
| bl1 | Atari ST DEGAS Elite Block |
| bl2 | Atari ST DEGAS Elite Block |
| bl3 | Atari ST DEGAS Elite Block |
| bld | MegaPaint Image |
| blend | Blender Data |
| blkrt | Block Artist Image |