| .BASIN | U.S. Army Corps of Engineers | Soubory nastavení | HEC-HMS Basin Model Settings File | HEC-HMS | U.S. Army Corps of Engineers |
| .BAU | Sun Microsystems | Soubory nastavení | Apache OpenOffice AutoText File | Apache OpenOffice | Apache Software Foundation |
| .BBD | Xilinx, Inc. | Soubory nastavení | Xilinx Black Box Definition | Xilinx CORE Generator System | Xilinx, Inc. |
| .BCP | Blackmagic Design | Soubory nastavení | BlackMagic Custom Palette | Adobe Photoshop | Adobe Systems Incorporated |
| .BCS | The Wavelength | Soubory nastavení | Batch Compiler Specification File | Batch Compiler | The Wavelength |
| .BCW | Micro Focus International plc | Soubory nastavení | Borland C++ Workspace Data | Borland C++ | Micro Focus International plc |
| .BDB2 | Brainmaster Technologies | Soubory nastavení | BrainMaster Settings | BrainAvatar | Brainmaster Technologies |
| .BDF | Willowsoft Creek Software | Soubory nastavení | Backup Definition File | Backup Made Simple | Willowsoft Creek Software |
| .BEX | Symantec Corporation | Soubory nastavení | PGP Binary Extracted Public Key | Pretty Good Privacy (PGP) | Symantec Corporation |
| .BFD | Open Source | Soubory nastavení | Linux BFD Rules Configuration Data | Linux | Open Source |
| .BGI | Microsoft Corporation | Soubory nastavení | BgInfo Configuration File | BgInfo | Microsoft Corporation |
| .BKS | Microsoft Corporation | Soubory nastavení | NTBackup Settings File | Microsoft Windows NT Backup - Restore Utility | Microsoft Corporation |
| .BLOB | Valve | Soubory nastavení | Valve Steam Archive | Steam | Valve |
| .BLT | AOL | Soubory nastavení | AIM Buddy List | AOL Instant Messenger (AIM) | AOL |
| .BLW | Adobe Systems Incorporated | Soubory nastavení | Adobe Photoshop Black And White Presets File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .BMM | Isao Maruoka | Soubory nastavení | Tacmi Pixia Palette | Pixia | Isao Maruoka |
| .BOOT | Flexera Software | Soubory nastavení | InstallShield Boot File | InstallShield | Flexera Software |
| .BRIDGESORT | Adobe Systems Incorporated | Soubory nastavení | Adobe Bridge Cabinet | Adobe Bridge CC | Adobe Systems Incorporated |
| .BSH | Open Source | Soubory nastavení | BeanShell Script | Microsoft Notepad | Microsoft Corporation |
| .BSI | Webteh | Soubory nastavení | BSPlayer Configuration File | BS.player | Webteh |
| .BT3 | MomSoft | Soubory nastavení | Control Runner Button Configuration File | Control Runner | MomSoft |
| .BVL | Corel | Soubory nastavení | Micrografx Picture Publisher 8 Textures File | Micrografx Picture Publisher | Corel |
| .BXX | Bitmanagement Software | Soubory nastavení | BS Contact Parameter File | Bitmanagement Software BS Contact | Bitmanagement Software |
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