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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .B | Rockstar Games | Developer Files | Grand Theft Auto 3 Saved Game File | Grand Theft Auto III | Rockstar Games |
| .B2D | Guilect | Developer Files | Brutus2D Source Code File | Brutus2D | Guilect |
| .B32 | Microsoft Corporation | Developer Files | MS-DOS BCC Data | MS-DOS | Microsoft Corporation |
| .BAS | SoftMaker Software | Developer Files | BASIC Source Code File | Softmaker Office | SoftMaker Software |
| .BASH | Apple | Developer Files | Unix Bourne Shell (Bash) Script | Notepad++ | Don Ho |
| .BAZ | Unknown Developer | Developer Files | Acomba Accounting Suite Backup | Acomba Accounting Suite | ACCEO |
| .BB | Blitz Research | Developer Files | Blitz Source Code File | BlitzMax | Blitz Research |
| .BBC | Richard T. Russell | Developer Files | BBC BASIC Data File | BBC BASIC for Windows | Richard T. Russell |
| .BBF | Open Source | Developer Files | ScriptBasic Compiled Binary File | ScriptBasic | Open Source |
| .BCC | Broderbund | Developer Files | Calendar Creator File | Calendar Creator | Broderbund |
| .BCP | Blackmagic Design | Developer Files | BlackMagic Custom Palette | Adobe Photoshop | Adobe Systems Incorporated |
| .BDSPROJ | Embarcadero Technologies | Developer Files | Borland Developer Studio Project | Borland C++ | Micro Focus International plc |
| .BET | Birger Møller-Pedersen and Kristen Nygaard | Developer Files | BETA Source File | Notepad++ | Don Ho |
| .BETA | Birger Møller-Pedersen and Kristen Nygaard | Developer Files | Beta Programming Language Source Code | Beta Programming Language | Birger Møller-Pedersen and Kristen Nygaard |
| .BFO | Unknown Developer | Developer Files | GT Nexus PDF Template | GT Nexus | Unknown Developer |
| .BGM | Tom Mulgrew | Developer Files | Basic4GL 3D Object | Basic4GL | Tom Mulgrew |
| .BHS | Microsoft Corporation | Developer Files | Rise Of Nations Script | Rise Of Nations | Big Huge Games |
| .BIZDESIGN | Actuate Corporation | Developer Files | BusinessReport Design File | BusinessReport | Actuate Corporation |
| .BMML | Balsamiq Studios, LLC | Developer Files | Balsamiq Mockups Graphics | Balsamiq Mockups | Balsamiq Studios, LLC |
| .BMT | Alpha Software | Developer Files | Alpha Five Image Library | Alpha Five | Alpha Software |
| .BOS | IBM | Developer Files | Build Options Specification File | IBM Rational ClearCase | IBM |
| .BP | Data Access Worldwide | Developer Files | DataFlex Business Process Object | DataFlex | Data Access Worldwide |
| .BPG | Open Source | Developer Files | Better Portable Graphics (BPG) Image | BPG viewer | Open Source |
| .BPL | Autodesk, Inc. | Developer Files | AutoCAD Batch Plot File | Autodesk AutoCAD | Autodesk, Inc. |
| .BPR | Embarcadero Technologies | Developer Files | Borland C++Builder Project File | C++Builder | Embarcadero Technologies |
| .BPT | Corel | Developer Files | CorelDRAW Bitmap Master Data | CorelDRAW Graphics Suite | Corel |
| .BRH | Sheshadrivasu Chandrashekaran | Developer Files | Baraha Document File | Baraha | Baraha Software |
| .BRX | Qualcomm | Developer Files | BREW Application Resource File | Brew MP SDK | Qualcomm |
| .BS2 | Parallax | Developer Files | BASIC Stamp 2 Code File | Microsoft Notepad | Microsoft Corporation |
| .BSC | Microsoft Corporation | Developer Files | Visual Studio Source Browser Information File | Microsoft Visual Studio | Microsoft Corporation |
| .BSH | Open Source | Developer Files | BeanShell Script | Microsoft Notepad | Microsoft Corporation |
| .BSM | Take-Two Interactive | Developer Files | Bioshock Map Data | BioShock | Take-Two Interactive |
| .BTN | Indigo Rose | Developer Files | AutoPlay Media Studio Button File | AutoPlay Media Studio | Indigo Rose |
| .BWR | Open Source | Developer Files | Kermit Beware Bug List | C-Kermit 9.0 | Open Source |
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