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File extensions starting with the letter B...
.B Limbo Implementation File (Inferno OS)
Applause Batch List
.B1J BookJones
.B1N 1st Reader Binary Screen Image
.B1S BookSmith
.B30 Ventura Publisher Printer Font
.B3D 3D Builder File
.B4 Helix Nuts and Bolts File (Helix Software now part of McAfee)
.B64 Base 64 MIME-encoded File [MIME]
.B8 Piclab Raw Graphic File
.BAC Backup
.BAD Rime Mailer Address File
Oracle BAD File
.BAK Backup
.BAL Ballade Music Score
.BAR dBase Application Generator Horizontal Menu Object
.BAS BASIC Language Source
Basic Module
.BAT Batch Processing
.BB Papyrus Database Backup
.BB2 XBBS-OS/2, XGROUP, AV and ZTree Archiver Control File
.BBL TeX/BibTeX Bibliographic Reference File
.BBM Deluxe Paint Image File
.BBS Bulletin Board Sytem Text
.BCF ConfigSafe Snapshot Index
.BCH dBase Application Generator Batch Process Object
Phoenix Software (Datalex) Entry Point 90 Data File
.BCK Backup
.BCM MS Works Communications File
.BCO Bitstream Fontware File
.BCP Borland C++ Makefile
.BCW Borland C++ 4.5 Environment Settings
.BDB MS Works Dababase File
.BDF West Point Bridge Designer File
.BDF Egret Data File
.BDR MS Publisher Border
.BEZ Bitstream Fontware File
.BF2 Bradford 2 Font
.BFA Blowfish-encrypted File (Extension added to original) [Program List]
.BFC Briefcase File
.BFF AIX® Backup File Format
.BFM UNIX Font Metrics File
.BFX BitFax Document
.BG MS Backgammon for Windows Game
.BGA OS/2 Graphic Array
.BGB MS Chat Background Graphic
.BGI Borland Graphic Interface
.BGL Flight Simulator Scenery File
.BHF pcAnywhere Host File
.BI Binary File
Progress Database Before Image File
.BIB Bibliography
TeX/BibTeX Literature Database
.BIF GroupWise Initialization File
Image Capture Board Binary Black & White Image
.BIG Chinese (old version)
.BIK BioCharter Profile Backup File
.BIN Binary File
.BIO BioCharter Profile File
OS/2 Bios File
.BIT Bitmap Image
.BK Backup
LinguAssist File
JetFax Faxbook File
.BK! Backup
.BK$ Backup
.BK1 Backup (Can be 1 to 9, usually with WordPerfect)
.BKI Backup Index
.BKP Backup
.BKS Bookshelf Backup
IBM BookManager Read Bookshelf
MS Works Spreadsheet Backup
.BKW FontEdit Fontset Mirror Image
.BLB DreamWorks Resource Archive
.BLD BASIC Bload Graphics
.BLK WordPerfect Temp File
Lightscape Block Library
Alias Wavefront Image
.BLL An extension used by the VBS/European-A worm. If found in the directory
C:\STARTUP suspect you are infected with this worm and have your computer
checked with anti-virus software!
.BLT Wordperfect for DOS File
.BM Graphic (bitmap)
.BM1 Apogee BioMenace Data File
.BMF Image File
.BMI Buzz Instrument
.BMK Help Bookmark
.BMP Windows OS/2 Bitmap Graphics [Viewer]
.BMS Backup Magic Backup Set
.BMW Buzz Music File with Waves
.BMX Buzz Music File
.BN AdLib Instrument Bank
.BNK Adlib Instrument Bank
SimCity Game File
(reported to be) Bink Compressed Video/Audio File
.BOL MS Booasm Compressed Archive Library
.BOM Orcad Schematic Capture Bill of Materials File
.BOO Image File
Book
Compressed Archive File
.BOX Notes Mailbox
.BPC Business Plan Toolkit Chart
.BPL Delphi Library
.BPS MS Works Document
.BPT Bitmap Master File
.BPX Truevision Targa Bitmap
.BQY BrioQuery File
.BR Bridge Script
.BR3 Bryce 3D Scene File
.BRC Bryce 2 Scene File
.BRD EAGLE Board File
.BRI Basic Rate Interface File
.BRK Brooktrout Fax-Mail File
.BRO Tree Professional Broadleaf Creator File
.BRP Tree Professional Broadleaf Creator Image
.BRW Application file associated with financial institution(s) loan applications
.BRX Multimedia Browsing Index
.BRZ DbBRZ File (Backup or Restore)
.BS_ MS Bookshelf Find Menu Shell Extension
.BS1 Apogee Blake Stone Data File
.BS2 Basic Stamp 2 Code File (WordPad or BS2-Editor)
.BSA BSARC Compressed Archive
.BSC Apple II Compressed Archive
Fortran Pwbrmake Object
Boyan Script
MS Developer Studio Browser File
.BSK Bryce 4 File
.BSP Quake Map
Half-life/TFC/CS Map
.BSV BASIC Bsave Graphics
.BTM 4DOS Batch To Memory Batch File
.BTN ButtonWare File
.BTR Btrieve Database File
MS Frontpage-related File
.BUD Quicken Backup
.BUG Bug (Problem) File
.BUN CakeWalk Audio Bundle File
.BUP Backup
.BUT Buttons! Button Definition
.BUY Movie Data File
.BV1 WordPerfect Overflow File (Can be 1 to 9)
.BVS BVS Solitaire Collection
.BW SGI Black and White Image
Silicon Graphics Raw RGB File
.BWB Visual Baler Spreadsheet File
.BWR Kermit Beware Bug List
.BWV Business Wave File
.BYU Movie File
.BZ Bzip UNIX Compressed File
.BZ2 Bzip UNIX Compressed File (Replaces .BZ)
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