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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .BC3 | Unknown Developer | Data Files | FIEBDC Database | FIEBDC | Unknown Developer |
| .BCC | Broderbund | Data Files | Calendar Creator File | Calendar Creator | Broderbund |
| .BCD | Microsoft Corporation | Data Files | Windows Boot Configuration Data File | Microsoft Registry Editor | Microsoft Corporation |
| .BCH | dBase, LLC | Data Files | dBASE Batch Process Object | dBase | dBase, LLC |
| .BCI | Belarc | Data Files | Belarc Advisor Report File | Mozilla Firefox | Mozilla |
| .BCL | Illumina | Data Files | Illumina Base Call File | Illumina BCL2FASTQ Conversion Software | Illumina |
| .BCM | Adobe Systems Incorporated | Data Files | Adobe Bridge Cache File | Adobe Bridge CC | Adobe Systems Incorporated |
| .BCR | PTV AG | Data Files | Map&guide Station List File | map&guide | PTV AG |
| .BCT | Adobe Systems Incorporated | Data Files | Adobe Bridge Thumbnail Cache File | Adobe Bridge CC | Adobe Systems Incorporated |
| .BCX | Systeam | Data Files | Beam Report Standard Definition File | Systeam Beam Report | Systeam |
| .BD | Sun Microsystems | Data Files | Solaris Browser Data File | Solaris | Oracle Corporation |
| .BDA | Research Systems, Inc | Data Files | Spectral Data File | Yohkoh Software | Research Systems, Inc |
| .BDC | Babylon Software Ltd. | Data Files | Babylon Dictionary File | Babylon | Babylon Software Ltd. |
| .BDF | Willowsoft Creek Software | Data Files | Backup Definition File | Backup Made Simple | Willowsoft Creek Software |
| .BDIC | Data Files | Chrome Dictionary File | Google Chrome | ||
| .BDIFF BUPDATE BINARY UPDATE | Unknown Developer | Data Files | Bdiff Bupdate Binary Update | Unknown Software | Unknown Developer |
| .BDV | Bitdefender | Data Files | BitDefender Data Vault | BitDefender | Bitdefender |
| .BDW | Snowmint Creative Solutions LLC | Data Files | Budget Data File | Budget | Snowmint Creative Solutions LLC |
| .BDX | Bitdefender | Data Files | BitDefender File | BitDefender | Bitdefender |
| .BE | Corel | Data Files | Paradox Query-By-Example Query | Corel Paradox | Corel |
| .BEA | SourceForge | Data Files | Beamer Song File | Beamer | SourceForge |
| .BEACON | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BEAT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BEATWAVE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BED | University of California, Santa Cruz (UCSC) | Data Files | UCSC BED Annotation Track File | Microsoft Word | Microsoft Corporation |
| .BEF | Dell Boomi | Data Files | Boomi Integration Platform Setup Information Data | Dell Boomi | Dell Boomi |
| .BEN | SiSoftware | Data Files | SiSoftware Sandra File | SiSoftware Sandra | SiSoftware |
| .BEP | SourceForge | Data Files | Beamer Playlist File | Beamer | SourceForge |
| .BEX | Symantec Corporation | Data Files | PGP Binary Extracted Public Key | Pretty Good Privacy (PGP) | Symantec Corporation |
| .BFR | SmartWare Corporation | Data Files | SmartWare Backup Report Definition | SmartWare | SmartWare Corporation |
| .BFX | Cheyenne Software (CYE) | Data Files | Bitware Fax Document | FaxSee Pro | SFaxTools |
| .BG | Canon Inc. | Data Files | Canon My Image Garden Background Preset File | My Image Garden | Canon Inc. |
| .BGL | Babylon Software Ltd. | Data Files | Babylon Glossary File | Babylon | Babylon Software Ltd. |
| .BGO | BigOven.com | Data Files | Bigoven Recipe Card File | BigOven | BigOven.com |
| .BHD | Symantec Corporation | Data Files | Backup Exec Deduplication Storage | Backup Exec | Symantec Corporation |
| .BHO | Louis Kessler | Data Files | Behold Organize File | Behold | Louis Kessler |
| .BI | Microsoft Corporation | Data Files | Binary File | Microsoft Notepad | Microsoft Corporation |
| .BIAR | SAP | Data Files | Business Intelligence Archive Resource | SAP BusinessObjects Business Intelligence | SAP |
| .BID | Avontus Software Corporation | Data Files | BidMaker Data File | BidMaker | Avontus Software Corporation |
| .BILL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BIM | Interscape | Data Files | Bytessence InstallMaker Document | Bytessence InstallMaker | Trutia Alexandru |
| .BIN | Unknown Developer | Data Files | Binary Disk Image File | IsoBuster | Smart Projects |
| .BJD | NDDigital | Data Files | NDDigital Print Bureau File | Unknown Software | Unknown Developer |
| .BJG | Symantec Corporation | Data Files | DESQview File | DESQview | Symantec Corporation |
| .BJO | Open Source | Data Files | TabRite Tablature File | TABrite | Open Source |
| .BK | Adobe Systems Incorporated | Data Files | FrameMaker Book File | Adobe FrameMaker | Adobe Systems Incorporated |
| .BKC | Softland | Data Files | Backup4all Backup Catalog | Backup4all | Softland |
| .BKG | Samsung Electronics | Data Files | Samsung Document | Unknown Software | Unknown Developer |
| .BKL | KeyCarbon | Data Files | KeyCarbon Binary Keystroke Log | Unknown Software | Unknown Developer |
| .BKY | SmartWare Corporation | Data Files | SmartWare Backup Keyboard File | SmartWare | SmartWare Corporation |
| .BL7 | Ellis Enterprises | Data Files | Bible Library 7 Project Package | Bible Library | Ellis Enterprises |
| .BLA | Adobe Systems Incorporated | Data Files | Adobe Black Colour Separation Data | Adobe Creative Cloud | Adobe Systems Incorporated |
| .BLACK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BLACKMORE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BLANK | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BLB | SourceForge | Data Files | Interactive Fiction Package Game File | Windows Frotz | SourceForge |
| .BLC | General Electric Company | Data Files | Biacore Instruments Project | BIACORE instruments | General Electric Company |
| .BLD | Cadsoft | Data Files | Envisioneer Building Project File | Cadsoft Envisioneer | Cadsoft |
| .BLG | Microsoft Corporation | Data Files | Windows Binary Performance Log File | Windows Performance Monitor | Microsoft Corporation |
| .BLN | Big Huge Games | Data Files | Rise Of Nations Campaign Media File | Rise Of Nations | Big Huge Games |
| .BLO | IBM | Data Files | IBM DB2 Binary Large Object Data | IBM DB2 | IBM |
| .BLO- | IBM | Data Files | IBM DB2 Binary Large Object Data | IBM DB2 | IBM |
| .BLOCK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BLOCKS | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BLOSSOMS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BLR | General Electric Company | Data Files | BIACORE Instruments And BIAlite Project | BIACORE instruments | General Electric Company |
| .BLURB | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BM2 | DynaVox Mayer-Johnson | Data Files | Boardmaker Interactive Board File | DynaVox Mayer-Johnson Boardmaker | DynaVox Mayer-Johnson |
| .BMAP | Apple | Data Files | Apple Macintosh Screen Font | Apple OS X | Apple |
| .BMB | PTC | Data Files | Pro/ENGINEER Temporary Data File | Pro/ENGINEER | PTC |
| .BMI | Autodesk, Inc. | Data Files | 3D Studio Max Plugin | Autodesk 3ds Max | Autodesk, Inc. |
| .BMPR | Balsamiq Studios, LLC | Data Files | Balsamiq Mockups Document | Balsamiq Mockups | Balsamiq Studios, LLC |
| .BMS | KONAMI | Data Files | BeatMania Song File | StepMania | Open Source |
| .BNF | IBM | Data Files | IBM Voice Type Languages Map Data | IBM Voice Type | IBM |
| .BNG | The Bingo Maker Team | Data Files | Bingo Maker Bingo Data Template | The Bingo Maker | The Bingo Maker Team |
| .BNK | Unknown Developer | Data Files | Adlib Instrument Bank | Adlib Tracker II | Adlib Tracker II |
| .BNL | Cadence Design Systems | Data Files | MicroSim PCBoard Netlist | OrCAD PCB Designer | Cadence Design Systems |
| .BOF | IBM | Data Files | IBM Voice Type Languages Tasks Enroll File | IBM Voice Type | IBM |
| .BOK | Pearson | Data Files | TestGen Testbank File | Pearson Education TestGen | Pearson |
| .BOM | Apple | Data Files | Mac OS X Bill Of Materials File | Echo One File Juicer | Echo One |
| .BONGO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BOOK | Adobe Systems Incorporated | Data Files | FrameMaker Book File | Adobe FrameMaker | Adobe Systems Incorporated |
| .BOR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BOV | Lawrence Livermore National Laboratory | Data Files | VisIt BOV File | VisIt | Lawrence Livermore National Laboratory |
| .BOX | Unknown Developer | Data Files | E-mail Mailbox | Mozilla Thunderbird | Mozilla |
| .BP | Data Access Worldwide | Data Files | DataFlex Business Process Object | DataFlex | Data Access Worldwide |
| .BPC | TODAY Systems, Inc. | Data Files | BuildPro File | BuildProfessional | TODAY Systems, Inc. |
| .BPD | Palo Alto Software | Data Files | Business Plan Pro File | Business Plan Pro | Palo Alto Software |
| .BPDX | Adobe Systems Incorporated | Data Files | Acrobat Batch PDX File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .BPF | Infor | Data Files | Baan ERP Document | b2Win | NAZDAQ |
| .BPJ | VISATON GmbH | Data Files | Boxsim Simulation Project | Boxsim | VISATON GmbH |
| .BPM | Simple DirectMedia Layer (SDL) | Data Files | Trados AutoSuggest Dictionary File | SDL Trados | SDL Trados |
| .BPW | Open Source | Data Files | Bitser Password File | Bitser | Open Source |
| .BPX | Truevision Inc. | Data Files | Truevision Targa Bitmap Image | XnView MP | XnSoft |
| .BQF | NOAA | Data Files | Wavewatch Binary Quadrupled File | Wavewatch | NOAA |
| .BR1 | Ghisler Software GmbH | Data Files | Total Commander Cached Button Bar Icons File | Total Commander | Ghisler Software GmbH |
| .BRA | Open Source | Data Files | Linux Data File | FreeBSD | The FreeBSD Community |
| .BRAIN | TheBrain Technologies | Data Files | PersonalBrain Mind Map File | TheBrain | TheBrain Technologies |
| .BRB | DAZ 3D | Data Files | Bryce Object Export | DAZ 3D Bryce | DAZ 3D |
| .BRD | Autodesk, Inc. | Data Files | EAGLE Circuit Board File | CadSoft EAGLE | Autodesk, Inc. |
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