.B | Rockstar Games | Game Files | Grand Theft Auto 3 Saved Game File | Microsoft Notepad | Microsoft Corporation |
.B!K | Microsoft Corporation | Data Files | Microsoft Flight Simulator Scenery File | Microsoft Flight Simulator | Microsoft Corporation |
.B32 | Microsoft Corporation | Developer Files | MS-DOS BCC Data | MS-DOS | Microsoft Corporation |
.BAD | Microsoft Corporation | Text Files | Exchange Badmail File | Microsoft Exchange Server | Microsoft Corporation |
.BAK | Various Developers | Backup Files | General Backup File | Microsoft SQL Server | Microsoft Corporation |
.BAR | BlackBerry | Compressed Files | BlackBerry OS 10 Application Installation Package | Microsoft Studios | Microsoft Corporation |
.BAT | Microsoft Corporation | Executable Files | DOS Batch File | Microsoft Word | Microsoft Corporation |
.BAY | Casio Computer Co., Ltd. | Camera Raw Files | Casio RAW Image | Microsoft Windows Photos | Microsoft Corporation |
.BBS | Open Source | Text Files | Bulletin Board System Text | Microsoft Notepad | Microsoft Corporation |
.BCD | Microsoft Corporation | System Files | Windows Boot Configuration Data File | Microsoft Registry Editor | Microsoft Corporation |
.BCM | Adobe Systems Incorporated | Data Files | Adobe Bridge Cache File | Microsoft Outlook 2016 | Microsoft Corporation |
.BCS | The Wavelength | Settings Files | Batch Compiler Specification File | Microsoft Notepad | Microsoft Corporation |
.BDB | Microsoft Corporation | Backup Files | Microsoft Works Database Backup File | Microsoft Access | Microsoft Corporation |
.BDP | Microsoft Corporation | Text Files | Exchange Diagnostic Message | Microsoft Exchange Server | Microsoft Corporation |
.BDR | Microsoft Corporation | Text Files | Exchange Non-Delivery Report Body File | Microsoft Exchange Server | Microsoft Corporation |
.BED | University of California, Santa Cruz (UCSC) | Data Files | UCSC BED Annotation Track File | Microsoft Word | Microsoft Corporation |
.BFB | Microsoft Corporation | Game Files | Zoo Tycoon 2 Model File | Zoo Tycoon 2 | Microsoft Corporation |
.BFC | Microsoft Corporation | Uncommon Files | Windows Briefcase File | Microsoft Windows Briefcase | Microsoft Corporation |
.BGI | Microsoft Corporation | Settings Files | BgInfo Configuration File | BgInfo | Microsoft Corporation |
.BGL | Babylon Software Ltd. | Data Files | Babylon Glossary File | Flight Simulator X | Microsoft Corporation |
.BGX | Bjarne Stroustrup | Graphic Files | BC45 | Microsoft C/C++ | Microsoft Corporation |
.BI | Microsoft Corporation | Data Files | Binary File | Microsoft Notepad | Microsoft Corporation |
.BIB | Oren Patashnik | Text Files | BibTeX Bibliography Database | Microsoft Notepad | Microsoft Corporation |
.BIK | RAD Game Tools | Video Files | Bink Video File | Microsoft Windows Media Player | Microsoft Corporation |
.BIO | IBM | System Files | BIOS File | Microsoft winhex | Microsoft Corporation |
.BITMAP | Various Developers | Raster Image Files | Bitmap Image File | Microsoft Windows Photos | Microsoft Corporation |
.BK1 | Autodesk, Inc. | Backup Files | Autodesk Backup File | Microsoft Windows | Microsoft Corporation |
.BK2 | Microsoft Corporation | System Files | Windows Indexing Service File | Microsoft Windows | Microsoft Corporation |
.BKF | Microsoft Corporation | Backup Files | Windows Backup Utility File | Microsoft Windows NT Backup - Restore Utility | Microsoft Corporation |
.BKS | Microsoft Corporation | Settings Files | NTBackup Settings File | Microsoft Windows NT Backup - Restore Utility | Microsoft Corporation |
.BKW | Microsoft Corporation | Graphic Files | FontEdit Image File | FontEdit | Microsoft Corporation |
.BLB | SourceForge | Game Files | Interactive Fiction Package Game File | Microsoft SQL Server | Microsoft Corporation |
.BLF | Microsoft Corporation | System Files | CLFS Base Log File | Microsoft Common Log File System (CLFS) | Microsoft Corporation |
.BLG | Microsoft Corporation | Data Files | Windows Binary Performance Log File | Windows Performance Monitor | Microsoft Corporation |
.BMC | Microsoft Corporation | Raster Image Files | Bitmap Cache File | Microsoft Windows | Microsoft Corporation |
.BMK | return7, LLC | Backup Files | BillMinder Backup File | Microsoft Windows Help | Microsoft Corporation |
.BML | Various Developers | Web Files | Bean Markup Language File | Microsoft Notepad | Microsoft Corporation |
.BMP | Various Developers | Raster Image Files | Bitmap Image File | Microsoft Windows Photos | Microsoft Corporation |
.BMQ | Acclaim Entertainment | Raster Image Files | Re-Volt Mipmap File | Microsoft Paint | Microsoft Corporation |
.BMX | Siemens AG | Raster Image Files | Siemens Mobile Animations File | Microsoft Windows Picture and Fax Viewer | Microsoft Corporation |
.BND | IBM | Uncommon Files | DB2 CLI Bind File | Flight Simulator X | Microsoft Corporation |
.BOK | Pearson | Data Files | TestGen Testbank File | Internet Explorer | Microsoft Corporation |
.BOOK | Adobe Systems Incorporated | Data Files | FrameMaker Book File | Microsoft Notepad | Microsoft Corporation |
.BOX | Unknown Developer | Data Files | E-mail Mailbox | Microsoft Windows 7 | Microsoft Corporation |
.BPD | Palo Alto Software | Data Files | Business Plan Pro File | Microsoft Windows | Microsoft Corporation |
.BPS | Symantec Corporation | Uncommon Files | BPS Programs Virus File | Microsoft Word | Microsoft Corporation |
.BPW | Open Source | Encoded Files | Bitser Password File | Microsoft Notepad | Microsoft Corporation |
.BQY | Oracle Corporation | Uncommon Files | Brio Query File | Internet Explorer | Microsoft Corporation |
.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 |
.BSD | IEEE Xplore | Data Files | Boundary Scan Description Language Data File | Microsoft Notepad | Microsoft Corporation |
.BSH | Open Source | Developer Files | BeanShell Script | Microsoft Notepad | Microsoft Corporation |
.BSM | Take-Two Interactive | Game Files | Bioshock Map Data | Microsoft SQL Server | Microsoft Corporation |
.BTAB | Microsoft Corporation | Text Files | Base Guitar Tabulature Data | Microsoft Notepad | Microsoft Corporation |
.BTC | Microsoft Corporation | Compressed Files | Becker Tools Compressed Archive | MS-DOS | Microsoft Corporation |
.BTF | Bank of America | Data Files | NationsBank Check Images | Microsoft Edge | Microsoft Corporation |
.BTIF | Bank of America | Data Files | NationsBank Check Images | Microsoft Edge | Microsoft Corporation |
.BTM | Microsoft Corporation | Data Files | BizTalk Map File | BizTalk Server | Microsoft Corporation |
.BTR | Pervasive Software | Database Files | Btrieve Database File | Microsoft FrontPage | Microsoft Corporation |
.BUT | ACD Systems | Uncommon Files | Canvas Web Button (CD Audio Track) | ACD Systems Canvas | Microsoft Corporation |