B
| Ext. | Description | Used by |
|---|---|---|
| B&W | Black and white graphics file | atari - mac |
| B&W | Mono binary screen image | 1st Reader |
| B | Batch list | APPLAUSE |
| B | Grand Theft Auto saved game | Any of the 3D Grand Theft Auto games in either III or IV era. |
| B_W | Black and white graphics file | Atari - mac |
| B1N | Both mono and color binary screen image | 1st Reader |
| B30 | Printer font (JLaser - Cordata) | Corel Ventura Publisher |
| B3D | Blitz3D files | |
| B8 | Raw graphics file (one byte per pixel) plane two | PicLab |
| BA | Binary Archive | Scifer Archiver and Compression |
| BAC | Compiled BASIC | RT-11 BASIC-11 |
| BAD | Bad file | Oracle Corporation - many |
| BAD | Animation file | Novalogic |
| BAD | File which covers bad blocks on disk volume (not to be moved) | RT-11 |
| BAK | Backup file | |
| BAL | Music score | Ballade |
| BALANCE | Balance accounting sheet file | Balance |
| BAP | Blaze Audio Wave Information File | BlazeAudio MadCap Software |
| BAR | Horizontal bar menu object file | dBASE Application Generator |
| BAR | Info Bar for GFX2EXE | GFX2EXE |
| BAR | Broker Archive. Compressed file containing number of other files for deployment. | IBM WebSphere Message Broker |
| BAS | BASIC language source | QuickBASIC - GW-BASIC - FreeBASIC |
| BAT | Batch file | MS-DOS, RT-11 |
| BB | Database backup | Papyrus Design Group |
| BBL | Bibliographic reference file | TeX/BibTeX |
| BBM | Brush | Deluxe Paint |
| BBP | Playlist | BassBox |
| BBQ | BitBeamer Transfer Queue file | BitBeamer |
| BBS | Bulletin Board System announce or text info file | |
| BBS | Hudson-style messagebase | FTN software |
| BC! | Unfinished download | Unfinished BitComet download (a BitTorrent client) |
| BCF | Card data | Bingo Card Creator |
| BCH | Batch process object file | dBASE Application Generator |
| BCH | Datafile | Datalex EntryPoint 90 |
| BCO | Outline font description | Bitstream Inc. |
| BCP | Borland C++ makefile | |
| BCT | Backup dictionary | Clarion |
| BCW | Environment settings | Borland C++ 4.5 |
| BDB | Bookends database | Bookends |
| BDC | Dictionary | Lingvo |
| BDEF | Builder Definition | Websphere Portlet Factory |
| BDF | Adobe Glyph Bitmap Distribution Format | Adobe Software |
| BDF | Binary update file | BUPDATE.EXE (c) TNT Techn. |
| BDF | Bitmap Distribution Format font file | X11 |
| BDF | Datafile | Egret |
| BDM | Videoclip | AVCHD |
| BDMV | Blu-ray Video Data Content file | Media players / software that supports Blu-ray structure |
| BDR | Border | Microsoft Publisher |
| BDT | Dictionary | Lingvo |
| BEF | Bleck Encrypted File | |
| BEZ | Outline font description | Bitstream |
| BF | Brainfuck sourcefile | |
| BF2 | Bradford 2 font | |
| BFC | Briefcase Win95 | Win95 |
| BFM | Font metrics | unix/Frame |
| BFX | Fax | BitFax |
| BGA | Bitmap graphics | |
| BGI | Borland Graphics Interface device driver | Turbo C - Turbo Pascal |
| BH | Blackhole | data compression format |
| BI | BASIC include file | Visual Basic - FreeBASIC |
| BIB | Bibliography (ASCII) | |
| BIB | Database - not compatible with TeX format | Papyrus |
| BIB | Literature database | TeX/BibTeX |
| BIF | Binary Image Format b&w graphics file | Image Capture board |
| BIK | Bink video file (RAD Video) | |
| BIN | Binary file, usually zero-start (.com analog) | |
| BIN | SGI Powerflip | |
| BIN | Text mode memory dump | The Draw - TUD - ACiDDraw - etc. |
| BIO | BioniX Wallpaper playlist file | BioniX Wallpaper Changer |
| BIO | OS/2 BIOS | |
| BIT | Bitmap X11 | |
| BK! | Document backup | WordPerfect for Win |
| BK | Faxbook | JetFax |
| BK? | Backup file | |
| BKC | Backup catalog | Backup4all |
| BKn | Timed backup file for document window n | WordPerfect for Win |
| BKP | Backup file | Write - TurboVidion DialogDesigner |
| BKW | Mirror image of font set | FontEdit |
| BLD | BLoaDable picture | BASIC |
| BLD | SYSGEN Build procedure file | RT-11 |
| BLEND | Blender3D Project File | Blender |
| BLG | Backup Log | ARCSOLO |
| BLK | Temporary file | WordPerfect for Win |
| BLOB | Unknown | Steam (software) for Win |
| BLP | Blizzard Game Picture | Blizzard Entertainment games (various) |
| BM | BitMap graphics file | |
| BM3 | UIQ3 Phone backup | |
| BMD | Nintendo proprietary 3D model file | Various Nintendo games |
| BMK | Help Bookmarks | Windows 3.x |
| BMP | OS/2 or Win graphics format (BitMap Picture) | QPeg - CorelDraw - PC Paintbrush - many |
| BMPW | bitmap world-file - geo-references info | |
| BMS | Nintendo proprietary MIDI tracker format | Various Nintendo games |
| BMT | Ami Pro Button | Ami Pro |
| BNA | Data | Atlas Boundary |
| BNK | Adlib instrument bank file | |
| BNR | Graphics Banner | Banner - Poster |
| BOK | Shamela Library book | Shamela Library Program |
| BOO | Book-format | READIBM |
| BOO | Compressed file ASCII archive created by BOO (msbooasm.arc) | msbooasm.arc |
| BOO | Boo programming language source file | Boo Programming Language |
| BOT | Bot files, these go with JKB files | Quake 3 Engine |
| BPC | Chart | Business Plan Toolkit |
| BPOLY | Data | Prisms binary 3D object |
| BPP | Backup application | Clarion |
| BPT | Bitmap fills file | CorelDRAW |
| BR | Script | Bridge |
| BRD | Eagle Layout File | |
| BRD | Tanzzle board file | Tanzzle |
| BRD | Cadence Allegro board file | Cadence |
| BRF | Braille | Braille embossers and refreshable displays |
| BRK | Fax | Brooktrout Fax-Mail |
| BRK | The Brake! Mailer REXX script | The Brake! |
| BRL | CAD | Ballistic Research Laboratory CAD |
| BS | Boot sector file | SYSLINUX |
| BS2 | Archive | BS2.EXE |
| BSA | Archive | BSArc |
| BSC | Compressed Apple II file archive created by BINSCII | BINSCII |
| BSC | Database | Source Browser |
| BSC | Pwbrmake object file | Microsoft Fortran |
| BSP | Half-Life\Half-Life 2 map files | Valve Corporation |
| BSS | boot sector (DOS) file | SYSLINUX |
| BSS | Casio Phone base | PC-LINK |
| BST | BiblioTex file (BiblioTex=bibliography file) | TeX |
| BSY | Busy flag | FTN soft |
| BTM | Batch-to-memory (quick batch) | 4dos -ndos |
| BTN | Makeover Button file | |
| BTX | backup of 4DOS batch files (_4INST.BTM) | 4DOS |
| BUFR | Binary Universal Form for the Representation of Meteorological Data | |
| BUG | Bugs and Problems | |
| BUN | LucasArts Bundle File | |
| BUP | Backup file | |
| BUT | Button definitions | Buttons! |
| BUY | Datafile format | movie |
| BVn | Overflow file below insert point in Doc n | WordPerfect for Win |
| BWB | Spreadsheet application | Visual Baler |
| BWR | Beware (buglist) | Kermit |
| BYU | BYU Movie | BYU |
| BZ2 | Archive | bzip2 |
| BZM | Map | Blitzkrieg |
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