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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | AbiWord | Open Source |
| .B3D | Blitz Research | 3D Image Files | Blitz3D Entity Model File | Irrlicht | Open Source |
| .B4U | Open Source | Text Files | Visual ReadMe Data File | docPointer | Open Source |
| .B8 | Open Source | Raster Image Files | Bitmap Picture File | IrfanView | Open Source |
| .BACKUP | Backup Files | Google Android Backup File | pgAdmin | Open Source | |
| .BAK | Various Developers | Backup Files | General Backup File | NetBSD | Open Source |
| .BAR | BlackBerry | Compressed Files | BlackBerry OS 10 Application Installation Package | Dragon UnPACKer | Open Source |
| .BAS | SoftMaker Software | Developer Files | BASIC Source Code File | FreeBASIC | Open Source |
| .BASE | Open Source | Data Files | BioArray Software Environment (BASE) Data File | BioArray Software Environment (BASE) | Open Source |
| .BAY | Casio Computer Co., Ltd. | Camera Raw Files | Casio RAW Image | Darktable | Open Source |
| .BBF | Open Source | Developer Files | ScriptBasic Compiled Binary File | ScriptBasic | Open Source |
| .BBS | Open Source | Text Files | Bulletin Board System Text | AbiWord | Open Source |
| .BCS | The Wavelength | Settings Files | Batch Compiler Specification File | PSPad | Open Source |
| .BDF | Willowsoft Creek Software | Backup Files | Backup Definition File | FontForge | Open Source |
| .BED | University of California, Santa Cruz (UCSC) | Data Files | UCSC BED Annotation Track File | AbiWord | Open Source |
| .BEK | Shanghai Nutshell Electronics | eBook Files | Shanda Bambook eBook | Calibre | Open Source |
| .BEM | Open Source | System Files | Babel Enterprise Module | Babel Enterprise | Open Source |
| .BFD | Open Source | Settings Files | Linux BFD Rules Configuration Data | Linux | Open Source |
| .BHW | Open Source | Graphic Files | Blophome Published Project | Blophome | Open Source |
| .BHX | Open Source | Encoded Files | BinHex Encoded File | UUDeview | Open Source |
| .BIB | Oren Patashnik | Text Files | BibTeX Bibliography Database | Notepad2 | Open Source |
| .BIF | MagicISO Inc. | Disk Image Files | Boot Information File | WinBiff | Open Source |
| .BIG | Electronic Arts | Game Files | Electronic Arts Game Data File | Dragon UnPACKer | Open Source |
| .BIL | ESRI | GIS Files | ESRI BIL File | GDAL | Open Source |
| .BIN | Unknown Developer | Disk Image Files | Binary Disk Image File | Linux | Open Source |
| .BITMAP | Various Developers | Raster Image Files | Bitmap Image File | IrfanView | Open Source |
| .BJO | Open Source | Data Files | TabRite Tablature File | TABrite | Open Source |
| .BKF | Microsoft Corporation | Backup Files | Windows Backup Utility File | Dragon UnPACKer | Open Source |
| .BLD | Cadsoft | Data Files | Envisioneer Building Project File | Skyscraper Simulator | Open Source |
| .BLP | Blizzard Entertainment Inc. | Game Files | Blizzard Texture File | Addon Studio for World of Warcraft | Open Source |
| .BMD | Webzen | Game Files | MU Online Game Data File | bmdview | Open Source |
| .BMM | Isao Maruoka | Settings Files | Tacmi Pixia Palette | Bleeper Music Maker | Open Source |
| .BMP | Various Developers | Raster Image Files | Bitmap Image File | IrfanView | Open Source |
| .BMS | KONAMI | Game Files | BeatMania Song File | StepMania | Open Source |
| .BOO | Open Source | Compressed Files | Booasm Compressed Archive | ZipZag | Open Source |
| .BOS | IBM | Developer Files | Build Options Specification File | Dragon UnPACKer | Open Source |
| .BPG | Open Source | Raster Image Files | Better Portable Graphics (BPG) Image | BPG viewer | Open Source |
| .BPS | Symantec Corporation | Uncommon Files | BPS Programs Virus File | MultiPatch patching tool | Open Source |
| .BPT | Corel | Raster Image Files | CorelDRAW Bitmap Master Data | COREX | Open Source |
| .BPW | Open Source | Encoded Files | Bitser Password File | Bitser | Open Source |
| .BRA | Open Source | Data Files | Linux Data File | Linux | Open Source |
| .BRN | BrainStorm Software | Data Files | BrainStorm Data File | Gabriel Knight 3 Barn Browser | Open Source |
| .BRSTM | Open Source | Audio Files | Binary Revolution Stream Audio File | BrawlBox | Open Source |
| .BRU | Open Source | Data Files | Brutus Restore Data | Brutus | Open Source |
| .BS1 | VirtualBus.info | 3D Image Files | VirtualBus Vehicle Configuration File | VirtualBus | Open Source |
| .BSA | Bethesda Softworks | Game Files | Bethesda Softworks Archive | BSA Commander | Open Source |
| .BSC | Microsoft Corporation | Developer Files | Visual Studio Source Browser Information File | ZX-Editor | Open Source |
| .BSD | IEEE Xplore | Data Files | Boundary Scan Description Language Data File | Notepad2 | Open Source |
| .BSE | Open Source | Data Files | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .BSH | Open Source | Developer Files | BeanShell Script | gVim | Open Source |
| .BSP | id Software | Game Files | Quake Engine Game Map File | Irrlicht | Open Source |
| .BST | Various Developers | Uncommon Files | BibTeX Style Document | TEXnicCenter | Open Source |
| .BTOA | Smith Micro Software | Encoded Files | Binary-to-ASCII Encoded File | ZipZag | Open Source |
| .BUN | Roland Corporation | Audio Files | Cakewalk Bundle File | Dragon UnPACKer | Open Source |
| .BWR | Open Source | Developer Files | Kermit Beware Bug List | C-Kermit 9.0 | Open Source |
| .BZ2 | Julian Seward | Compressed Files | Bzip2 Compressed File | PeaZip | Open Source |
| .BZABW | Abisource | Text Files | Compressed AbiWord Document File | AbiWord | Open Source |
| .BZIP2 | Julian Seward | Compressed Files | Bzip2 Compressed Archive | PeaZip | Open Source |
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