| .BMPR | Balsamiq Studios, LLC | Arquivos de dados | Balsamiq Mockups Document | Balsamiq Mockups | Balsamiq Studios, LLC |
| .BMS | KONAMI | Arquivos de dados | BeatMania Song File | StepMania | Open Source |
| .BNF | IBM | Arquivos de dados | IBM Voice Type Languages Map Data | IBM Voice Type | IBM |
| .BNG | The Bingo Maker Team | Arquivos de dados | Bingo Maker Bingo Data Template | The Bingo Maker | The Bingo Maker Team |
| .BNK | Unknown Developer | Arquivos de dados | Adlib Instrument Bank | Adlib Tracker II | Adlib Tracker II |
| .BNL | Cadence Design Systems | Arquivos de dados | MicroSim PCBoard Netlist | OrCAD PCB Designer | Cadence Design Systems |
| .BOF | IBM | Arquivos de dados | IBM Voice Type Languages Tasks Enroll File | IBM Voice Type | IBM |
| .BOK | Pearson | Arquivos de dados | TestGen Testbank File | Pearson Education TestGen | Pearson |
| .BOM | Apple | Arquivos de dados | Mac OS X Bill Of Materials File | Echo One File Juicer | Echo One |
| .BONGO | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BOOK | Adobe Systems Incorporated | Arquivos de dados | FrameMaker Book File | Adobe FrameMaker | Adobe Systems Incorporated |
| .BOR | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BOV | Lawrence Livermore National Laboratory | Arquivos de dados | VisIt BOV File | VisIt | Lawrence Livermore National Laboratory |
| .BOX | Unknown Developer | Arquivos de dados | E-mail Mailbox | Mozilla Thunderbird | Mozilla |
| .BP | Data Access Worldwide | Arquivos de dados | DataFlex Business Process Object | DataFlex | Data Access Worldwide |
| .BPC | TODAY Systems, Inc. | Arquivos de dados | BuildPro File | BuildProfessional | TODAY Systems, Inc. |
| .BPD | Palo Alto Software | Arquivos de dados | Business Plan Pro File | Business Plan Pro | Palo Alto Software |
| .BPDX | Adobe Systems Incorporated | Arquivos de dados | Acrobat Batch PDX File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .BPF | Infor | Arquivos de dados | Baan ERP Document | b2Win | NAZDAQ |
| .BPJ | VISATON GmbH | Arquivos de dados | Boxsim Simulation Project | Boxsim | VISATON GmbH |
| .BPM | Simple DirectMedia Layer (SDL) | Arquivos de dados | Trados AutoSuggest Dictionary File | SDL Trados | SDL Trados |
| .BPW | Open Source | Arquivos de dados | Bitser Password File | Bitser | Open Source |
| .BPX | Truevision Inc. | Arquivos de dados | Truevision Targa Bitmap Image | XnView MP | XnSoft |
| .BQF | NOAA | Arquivos de dados | Wavewatch Binary Quadrupled File | Wavewatch | NOAA |
| .BR1 | Ghisler Software GmbH | Arquivos de dados | Total Commander Cached Button Bar Icons File | Total Commander | Ghisler Software GmbH |
| .BRA | Open Source | Arquivos de dados | Linux Data File | FreeBSD | The FreeBSD Community |
| .BRAIN | TheBrain Technologies | Arquivos de dados | PersonalBrain Mind Map File | TheBrain | TheBrain Technologies |
| .BRB | DAZ 3D | Arquivos de dados | Bryce Object Export | DAZ 3D Bryce | DAZ 3D |
| .BRD | Autodesk, Inc. | Arquivos de dados | EAGLE Circuit Board File | CadSoft EAGLE | Autodesk, Inc. |
| .BRF | Duxbury Systems | Arquivos de dados | Braille Ready Format File | Duxbury Braille Translator | Duxbury Systems |
| .BRL | Duxbury Systems | Arquivos de dados | MicroBraille File | Duxbury Braille Translator | Duxbury Systems |
| .BRN | BrainStorm Software | Arquivos de dados | BrainStorm Data File | BrainStorm | BrainStorm Software |
| .BRP | Onyx Computing | Arquivos de dados | Tree Professional Broadleaf Creator Image | OnyxTREE BROADLEAF | Onyx Computing |
| .BRS | Adobe Systems Incorporated | Arquivos de dados | RoboHelp Browse Sequence File | Adobe RoboHelp | Adobe Systems Incorporated |
| .BRT | DAZ 3D | Arquivos de dados | Bryce Textures File | DAZ 3D Bryce | DAZ 3D |
| .BRU | Open Source | Arquivos de dados | Brutus Restore Data | Brutus | Open Source |
| .BRW | Calyx Technology | Arquivos de dados | Calyx Point File | Calyx Point | Calyx Technology |
| .BSB | Take-Two Interactive | Arquivos de dados | BioShock Saved Game File | BioShock | Take-Two Interactive |
| .BSC | Microsoft Corporation | Arquivos de dados | Visual Studio Source Browser Information File | Microsoft Visual Studio | Microsoft Corporation |
| .BSD | IEEE Xplore | Arquivos de dados | Boundary Scan Description Language Data File | Microsoft Notepad | Microsoft Corporation |
| .BSE | Open Source | Arquivos de dados | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .BSU | Brindys Software | Arquivos de dados | Brindys BriTray File | BriTray | Brindys Software |
| .BSV | Bluespec, Inc. | Arquivos de dados | Bluespec System Verilog Data File | Bluespec Development Workstation | Bluespec, Inc. |
| .BSX | Parallax | Arquivos de dados | PBASIC Preprocessor Output | BASIC Stamp Windows Editor | Parallax |
| .BSY | Paul Rädle | Arquivos de dados | VTrain Learning Cardfile | Vocabulary Trainer (VTrain) | Paul Rädle |
| .BTF | Bank of America | Arquivos de dados | NationsBank Check Images | Microsoft Edge | Microsoft Corporation |
| .BTIF | Bank of America | Arquivos de dados | NationsBank Check Images | Microsoft Edge | Microsoft Corporation |
| .BTM | Microsoft Corporation | Arquivos de dados | BizTalk Map File | BizTalk Server | Microsoft Corporation |
| .BTR | Pervasive Software | Arquivos de dados | Btrieve Database File | Pervasive Btrieve Database Manager | Actian Corporation |
| .BUFFER | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BUL | Physiome Project | Arquivos de dados | JSim Bullseye Data Format | JSim | Physiome Project |
| .BURST | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BUSH | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BVN | Hans Hundegger | Arquivos de dados | Hundegger CNC Machining Format | CAMBIUM | Hans Hundegger |
| .BWD | BanglaSoftware Group | Arquivos de dados | BanglaWord Document File | BanglaWord | BanglaSoftware Group |
| .BWM | Statistics Netherlands | Arquivos de dados | Blaise Data File | Blaise | Statistics Netherlands |
| .BXI | Statistics Netherlands | Arquivos de dados | Blaise Data File | Blaise | Statistics Netherlands |
| .BXT | Traxon Technologies | Arquivos de dados | ETH2DALI Firmware | ETH2DALI | Traxon Technologies |
| .BXU | Sony | Arquivos de dados | PictureGear Studio File | PictureGear Studio | Sony |
| .BXX | Bitmanagement Software | Arquivos de dados | BS Contact Parameter File | Bitmanagement Software BS Contact | Bitmanagement Software |
| .BY | Cadence Design Systems | Arquivos de dados | PSpice Data | Pspice | Cadence Design Systems |
| .BYTES | Unity Technologies | Arquivos de dados | Unity Binary Text Asset Data | Unity Technologies Unity | Unity Technologies |
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