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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .B!K | Microsoft Corporation | Data Files | Microsoft Flight Simulator Scenery File | Microsoft Flight Simulator | Microsoft Corporation |
| .B00 | VSO Software | Data Files | Blindwrite Data | BlindWrite | VSO Software |
| .B1 | The Catalina Group | Data Files | B1 Compressed Archive | B1 Free Archiver | The Catalina Group |
| .B25 | David Pilling | Data Files | Ovation Pro For RISC OS DDL Data | Ovation Pro Reader | David Pilling |
| .B26 | David Pilling | Data Files | Ovation Pro For RISC OS Style Sheet File | Ovation Pro Reader | David Pilling |
| .B2Z | Unknown Developer | Data Files | B2Z dVS Model/Object | Unknown Software | Unknown Developer |
| .B4 | McAfee, Inc. | Data Files | Helix Nuts And Bolts File | McAfee VirusScan Enterprise | McAfee, Inc. |
| .B4A | Native Instruments | Data Files | Native Instruments B4 II Data | Native Instruments Kontakt | Native Instruments |
| .B4F | Sakysoft | Data Files | Burn4Free Project File | Burn4Free | Sakysoft |
| .B4P | Native Instruments | Data Files | Native Instruments B4 II Preset | Native Instruments Kontakt | Native Instruments |
| .B5 | MDBG | Data Files | MDBG Chinese-English Dictionary Data | MDBG Chinese-English dictionary | MDBG |
| .BAB | Korenthal Associates | Data Files | Babble! Data File | Babble! | Korenthal Associates |
| .BACK | Interscape | Data Files | RMCProfile Coefficient | RMCProfile | Interscape |
| .BAD | Microsoft Corporation | Data Files | Exchange Badmail File | Microsoft Exchange Server | Microsoft Corporation |
| .BAI2 | Bank Administration Institute (BAI) | Data Files | Cash Management Balance Reporting Specifications Version 2 | Unknown Software | Unknown Developer |
| .BAK | Various Developers | Data Files | General Backup File | Microsoft SQL Server | Microsoft Corporation |
| .BAL | Borland | Data Files | Borland Programming Language Source Code | Sublime Text | Sublime HQ Pty Ltd |
| .BALL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BANNER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BAR | BlackBerry | Data Files | BlackBerry OS 10 Application Installation Package | Blackberry 10 | BlackBerry |
| .BASE | Open Source | Data Files | BioArray Software Environment (BASE) Data File | BioArray Software Environment (BASE) | Open Source |
| .BATCH | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BATH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BB2 | IBM | Data Files | XBBS-OS/2, XGROUP, AV, ZTree Archiver Control Data File | OS/2 | IBM |
| .BBL | Thomas Feuerstack | Data Files | BibTeX Generated Bibliography File | Bib2x | Alexander Feder |
| .BBM | Electronic Arts | Data Files | Deluxe Paint Bitmap Image File | Canvas X | ACD Systems |
| .BBT | Procedimientos-Uno, S.L. | Data Files | BTwin Local Database File | BTwin | Procedimientos-Uno, S.L. |
| .BBU | Genesis One Technologies | Data Files | BossBackup2 Backup Set | BossBackup2 | Genesis One Technologies |
| .BC | BitComet Development Group | Data Files | BitComet Partially Downloaded File | BitComet | BitComet Development Group |
| .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. |
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