#_B_EXTENSIONS

.B    Backup file.
.B    Batch file.
.B&W  Black and White or Mono color image file.
.B_W  Black and White or Mono color image file.
.B3D  Blitz3D mesh prop file (Dyvision Works' Advanced Landscape Editor).
.B3D  Blitz3D model or mesh file (Blitz3D and many BlitzBasic applications).
.B4   Backup file.
.B5I  BlindWrite 5 disk Image file (VSO Software's BlindWrite 5, Power Software's Free Any Burn).
.B5T  BlindWrite 5 disk image Table of contents file (VSO Software BlindWrite 5).
.B64  Base 64 encoded file - MIME encoded (Many applications).
.B6T  BlindWrite 6 disk image Table of contents file (VSO Software's BlindWrite 6).
.BA_  Sample Batch file (ZedTech's ZTreeWin).
.BA1  Backup file (Integra Computing's BillPower).
.BAC  Bacchus game save file.
.BAC  Backup file.
.BACK Backup file.
.BACKUP Automatic Backup file (Matt Pyne's TinyCAD).
.BACKUP Backup file.
.BAD  Bad/damaged file.
.BAFL BurnAware File List file (BurnAware Technologies' BurnAware).
.BAK  Backup file (Many applications).
.BAL  Ballade musical score file (Many audio applications).
.BAM  Block Availability Map file.
.BAN  Babarosa GIF Animation project file (Liatro's Babarosa).
.BAN  Banner document file (Sierra On-Line's Print Artist 3).
.BAN  Banner project file (MindScape PrintMaster).
.BANM Bannermaker banner file (Bannermaker).
.BAS  Beginners All purpose Symbolic Instruction Code/BASIC module or subroutine file (many BASIC programming language variants).
.BAS  Beginners All purpose Symbolic Instruction Code/BASIC program file (many BASIC programming language variants).
.BAS  Beginners All purpose Symbolic Instruction Code/BASIC program code snippet file (many BASIC programming language variants).
.BAS  Beginners All purpose Symbolic Instruction Code/BASIC program source code file (many BASIC programming language variants).
.BAS  FreeBASIC program or source code file = text (FreeBasic IDE, KetilO's FbEdit FreeBASIC Editor, Nicholas Christopoulos' SmallBASIC and many other applications).
.BAT  Batch file = a script file that supports branching and logical functions that executes command line arguments similar to Unix shell scripts (DOS/Windows operating systems).
.BATCH Batch file.
.BAU  Archive format container (Lotus Symphony).
.BAU  Writer Autotext resource file locations (LibreOffice).
.BB   Blitz Basic language program or script file (Dyvision Works' Advanced Landscape Editor).
.BB   Blitz Basic source code or application (Blitz Basic, Komodo Edit, and other applications).
.BB2  Archiver control file (ZedTech's ZTreeWin).
.BBC  BBC BASIC program file.
.BBC  BBCode file.
.BBL  Benchmark Baseline file = user generated results file (Dacris Benchmark).
.BBL  Bibliography file.
.BBL  TeX Bibliography file.
.BBM  Bitmap image file (Deluxe Paint).
.BBS  Bulletin Board System file or documentation (Many BBS/bulletin board applications).
.BC   Business Card document file (Sierra On-Line's Print Artist 3).
.BCH  Batch file.
.BCKIT Beatcraft Kit file (Acoustica's Beatcraft).
.BCP  Bitcollider Plug-in container = ZIP archive (Bitzi's BitCollider).
.BCP  Borland C++ file.
.BCP  Business Card file (CAM Development Business Card Designer Plus).
.BCPROJ Beatcraft Project file (Acoustica's Beatcraft).
.BCSAMPLE Beatcraft Sample file (Acoustica's Beatcraft).
.BCTEMPLATE Beatcraft project Template file (Acoustica's Beatcraft).
.BD   Boulder Dash game levels container file.
.BDB  Burner Database file (NewTech/Creative SoundBlaster cards).
.BDF  NuGraf Scenes file (Okino Computer Graphics' PolyTrans).
.BDMV BluRay Disc Movie file (BD media).
.BDR  Borders file = Document border decoration bitmap images and reference indexes for Office applications (Microsoft Office).
.BER  Boss Everywhere Report file (Alexander Jmerik's Boss Everywhere 2).
.BEV  Button bevelling template file.
.BEVEL Bevel file (Neuber Font Twister).
.BF   Blowfish encrypted file (Document encryption/decryption applications).
.BFC  Briefcase file = Container/archive file (Microsoft Windows operating systems).
.BFC  Font configuration file (IBM Lotus Symphony).
.BFC  Font configuration file (Sun/Oracle Java Runtime Environment/JRE).
.BFF  Buttonz! Factory File (Buttonz!).
.BFT  Bitmap Font Table image file = bitmap image (Font manager applications).
.BFX  BitFax Fax file (Bitware BitFax).
.BG   Background image tile/texture file (Games).
.BGI  Borland Graphics Interface file = Video card driver for a Borland C++ application.
.BGL  Background scenery Library file (Microsoft Flight Simulator - many variants).
.BGT  Budget database file (William Odlum's Budget For Success).
.BHO  Browser Helper Object file = GIF static image (Nothing Else Matters' vTuner).
.BHX  BinHex format archive container (Many applications).
.BI   FreeBASIC include/headers file (KetilO's FbEdit FreeBASIC Editor, FreeBasic IDE).
.BIB  Bibliography document file.
.BIB  BibTeX document file.
.BIBTEX BibTeX document file.
.BIF  Boot Image File (Power Software's Free Any Burn).
.BIF  byLight 20/20 Image File (byLight Technologies' 20/20 2.2).
.BIK  Bink encoded video file frequently employed by game developers (Bink).
.BIN  Compressed volume file (DoubleSpace).
.BIN  Binary data file (Too Many OSs and applications).
.BIN  MacBinary archive file (SmithMicro's Stuffit Deluxe and other archive applications).
.BIN  Raw binary disk/RAM/ROM image (Many applications, many variants).
.BINK Bink encoded video file frequently employed by game developers (Bink).
.BIT  Bitmap image file = Microsoft Windows BMP image (Many applications).
.BITMAP Bitmap image project file (Insane Tools' 3D Flash Animator 3).
.BIZ  Business card project file (MindScape PrintMaster Publishing Suite).
.BIZ  Business/developer's contact/ordering information file.
.BJC  Documentation for BJC series printers.
.BK6  SafeIT address book Backup file (SoftNet Security's SafeIT Encryption v6).
.BKF  Backup File (Microsoft Windows Backup Utility).
.BKG  Background image file (Many applications).
.BLANK Empty form/template file.
.BLD  BLOAD image file = Image loaded into memory with BASIC's BLOAD command.
.BLEND Blender file (Stichting Blender Foundation's Blender).
.BLF  Resource file (Shogun Total War).
.BLG  Binary-format Log file (Microsoft Windows Performance Monitor).
.BLK  Black and White/Mono color image file (Many variants).
.BLUE Blue project file (Steven Yi's Blue).
.BM   BitMagic downloaded content file (Bitmagic).
.BM   Bitmap image file (Many applications and variants).
.BM   Bookmarks file (NullSoft's WinAmp).
.BMF  Bitmap image File.
.BMI  Buzz Musical Instrument file (Buzz/Buzz Composer).
.BMK  Bookmark file (Many applications).
.BMK  Bookmark file = User generated bookmark (Microsoft Windows 3.x/9x Help systems).
.BMM  BitMagic player skin file (Bitmagic).
.BMP  Bitmap image file (Many variants, many programs). The Win/OS2 BMP file can hold pixel depths up to 32 bits and supports transparency.
.BMR  BlueMatter content Reference file (MusicMatch Jukebox).
.BMR  BlueMatter Offer file (MusicMatch Jukebox).
.BMT  BlueMatter song file (MusicMatch Jukebox).
.BMW  Buzz Song/loop without waves file (Buzz Digital Composer).
.BMX  Buzz Song/loop with waves file (Buzz Digital Composer).
.BONK Bonk audio file (MultiMediaConverters' MC Full Audio Converter).
.BOO  Boo format archive file.
.BOO  Boo language script file (NaroCAD).
.BOOPROJ Boo Project file (sharpdevelop.net's JSharp Develop 4).
.BOOT Bootscreen image file = Bitmap image.
.BOOTSKIN Stardock Bootskin boot screen.
.BP   BankPerfect file (Fabio Chelly's BankPerfect).
.BP6  Secure Profile Backup (SoftNet Security's SafeIT Encryption v6).
.BPC  BuddyPhone Contact file (BuddyPhone 2).
.BPDX Batch PDX file (Adobe Acrobat).
.BPK  C++ Builder Project file (Borland C++Builder).
.BPR  C++ Builder Project file (Borland C++Builder).
.BPS  Bullet Proof FTP Session file (Bullet Proof Software's Bullet Proof FTP).
.BR3  Bryce version 3 project file (Corel Bryce).
.BR4  Bryce version 4 project file (Corel Bryce).
.BR5  Bryce version 5 project file (Corel Bryce).
.BRC  Bryce version 2 project file (MetaCreations' Bryce).
.BRM  BRM movie plug-in file for Adobe Photoshop.
.BRO  Brochure file.
.BRO  Brochure project file (MindScape PrintMaster Gold).
.BRO  Documentation file (old Brother hardware/printer software distributions).
.BRP  O&O Defrag reports file.
.BRS  Brush file = bitmap image.
.BRT  Bryce Textures file (Corel Bryce).
.BRUSH Brush file = bitmap image.
.BSA  BackStreet download session file (Spadix Software's BackStreet Browser).
.BSC  BASIC program or archive.
.BSH  Bean Shell script file (Unix operating systems).
.BSP  Binary Space Partitioning file used in 3D world design applications and many games.
.BSP  Game map = Maps of games that employ Valve's Half-Life game engine (Valve's Half-Life/Team Fortress/Counterstrike/etcetera, games from other developers).
.BSZ  BSPlayer Skin ZIP archive file (BSPlayer).
.BTAPP BitTorrent Application file (BitTorrent's µTorrent).
.BTDNA BitTorrent DNA file (BitTorrent's µTorrent).
.BTINSTALL BitTorrent Install Package file (BitTorrent's µTorrent).
.BTKEY BitTorrent Key file (BitTorrent's µTorrent).
.BTSEARCH BitTorrent Search file (BitTorrent µTorrent).
.BTSKIN BitTorrent application Skinning file (BitTorrent's µTorrent).
.BUJ  Back-Up Job file (Personal Backup).
.BUN  Bundle file (Twelve Tone's Cakewalk).
.BUP  Backup file (Many applications).
.BUP  Bumpmap image file (Many applications).
.BUT  Button image file (Many applications, especially web site development).
.BVL  Bevel edge image file (Micrografx Picture Publisher).
.BW   Silicon Graphics Black & White image file (Many applications).
.BWA  BlindWrite Builder file (VSO Software's BlindWrite).
.BWA  Blitz World Assembler world file (Luke Hoschke's Blitz World Assembler).
.BWF  WAV audio file (QuickTime 7.7.2).
.BWG  BWG data disk project file (Jack W. Griffin's BWG Burn).
.BWI  BlindWrite Image file (Power Software's Free Any Burn).
.BWT  BlindWrite Image file.
.BZ   BZip format archive container file (Many applications).
.BZ2  BZip2 compressed file (Many applications - Julian Seward's BZIP.ORG).
.BZF  BZip compressed file (Many applications - Julian Seward's BZIP.ORG).
.BZIP2 BZip2 compressed file (Many applications - Info at BZIP.ORG).
.BZW  BZFlag World file.

Updated 11/25/2013