.??_ Files ending in "_" are
often compressed install files of the same
name (e.g., .EX_ expands to .EXE,
.DL_ expands to .DLL, etc.)
.B Limbo Implementation File (Inferno OS)
Brainf*ck Program (small programming language)
Befunge Program
Grand Theft Auto 3 Save File
Applause Batch List
.B02 ADP Payroll (unverified)
.B16 PCO Graphic [XnView]
.B1J BookJones
.B1N 1st Reader Binary Screen Image
.B1S BookSmith
.B30 Ventura Publisher Printer Font
.B3D 3D Builder File
BDE Multipath Movie Digital Viewer
.B4 Helix Nuts and Bolts File
(Helix Software now part of McAfee)
.B4S Winamp 3+ Playlist
.B5S Numerical Controlled Machine File (Ball-bar?)
.B64 Base 64 MIME-encoded File
[MIME] (WinZip to access)
.B8 Piclab Raw Graphic File
.B&W Atari Black and White Graphics
1st Reader Mono Binary Screen Image
Image Lab [XnView]
.B_W Atari/Macintosh Black and White Graphic
1st Reader Mono Binary Screen Image
Image Lab [XnView]
.BAC Backup
.BACKUP Ad-aware Referencefile Backup
.BAD Rime Mailer Address File
Oracle BAD File
Brutus Application Definition File
(password cracking)
.BAF Infinity Game Engine Script [More Info]
.BAG PMMail Mail Index File
OS/2 Netfinity Manager Sysinfo File (adapter.bag)
AOL Instant Messenger File
Emperor: Battle for Dune Archive
[Dragon UnPACKer]
.BAH Infinity Game Engine File
(Baldur's Gate 2 only) [More Info]
.BAK Backup
.BAL Ballade Music Score
.BAM Infinity Game Engine Animation and Multi-frame Graphics
[Edit with BAMWorkshop] [More Info]
Zlib Compressed Infinity Game Engine
Animation and Multi-frame Graphics (
Baldur's Gate 2 only) [Edit with BAMWorkshop] [More Info]
.BAN Sierra Print Artist Banner
.BAR dBase Application Generator Horizontal Menu Object
.BAS BASIC Language Source
Basic Module
.BAT Batch Processing (DOS Batch File)
.BAV The Bat! E-mail Client Anti-Virus File
.BB Papyrus Database Backup
Blitz Basic File
Starfleet Battles DOS Game
.BB2 XBBS-OS/2, XGROUP, AV and ZTree Archiver Control File
.BBC BBC BASIC File
.BBL TeX/BibTeX Bibliographic Reference File
.BBM Deluxe Paint Image File
.BBMA Bonzibuddy
.BBP BitBeamer Split File (of the form .??_??.bbp)
.BBQ BitBeamer Transfer Queue File
.BBS Bulletin Board Sytem Text
.BC Sierra Print Artist Business Card
.BC3 Fiebdc-3 Format File
(Format of Interchange ESTANDAR of Data bases of CONSTRUCTION)
.BCC Calendar Creator 8 Collection
.BCF ConfigSafe Snapshot Index
The Sims (Maxis) 3D Body Mesh File
.BCH dBase Application Generator Batch Process Object
Datalex EntryPoint 90 Data File
Phoenix Software (Datalex) Entry Point 90 Data File
.BCK Backup
.BCM Microsoft Works Communications File
.BCN Business Card Pro Design
.BCO Bitstream Fontware File
MicroSim PCBoard Backward Engineering Change Order
(layout-to-schematic)
.BCP Borland C++ Makefile
.BCS Infinity Game Engine Compiled Script [More Info]
.BCT Clarion Backup Dictionary
Business Card Designer Template
.BCW Borland C++ 4.5 Environment Settings
.BDB Microsoft Works Dababase File
.BDE Borland Database Engine
(embedded in many different programs)
.BDF West Point Bridge Designer File
.BDF Egret Data File
X11 Bitmap Distribution Format
Backup To CD-RW Backup Definition File
.BDG Badge Designer 2000 Photo ID
.BDR Microsoft Publisher Border  [Buy Office XP at Shop.Microsoft]
.BEC Break Even Calculator
.BED InfoSnorkel Blue Elephant Definition
(define content InfoSnorkel extracts from web page)
.BEZ Bitstream Fontware File
.BF Brainf*ck Program (small programming language)
Befunge Program
.BF2 Bradford 2 Font
Bidfax 2000 SE Database
(help to obtain bids on jobs that are subbed out)
.BFA Blowfish-encrypted File
(Extension added to original) [Program List]
.BFC Briefcase File
.BFF AIX® Backup File Format
.BFFM B17 Flying Fortress Game File (
link is to support page)
.BFL Colin McRae Rally 2 Data File
BFLI [XnView]
.BFLI BFLI [XnView]
.BFM UNIX Font Metrics File
.BFX BitFax Document
BFX Bitware [XnView]
.BG Microsoft Backgammon for Windows Game
.BGA OS/2 Graphic Array [XnView]
.BGB Microsoft Chat Background Graphic
.BGI Borland Graphic Interface
.BGL Flight Simulator Scenery File
Babylon Glossary File
.BGM Jane's Combat Simulations F-15
.BH BlackHole Archive Format File [ZipTV]
.BHF pcAnywhere Host File
.BHTML BabuHTML Embedded Software
File (example use: netMailshar)
.BHX Archive File
.BI Binary File
Progress Database Before Image File
.BIB Bibliography
Papyrus Database
TeX/BibTeX Literature Database
.BIC Civilization III Scenario
.BID BidMaker 2002 File (software
to aid in making bids on jobs)
.BIE JBIG File [XnView]
.BIF GroupWise Initialization File
Image Capture Board Binary Black & White Image
Baldur's Gate Archive [Dragon UnPACKer]
Planescape: Torment Archive [Dragon UnPACKer]
Infinity Game Engine Archive of Resources
(indexed by .KEY file) [More Info]
.BIG Chinese (old version)
Cartes Michelin [XnView]
.BIK BioCharter Profile Backup File
Bink Game Video File
.BIL ArcView Image File (band interleaved by line)
.BIN Binary File (many)
.BIO BioCharter Profile File
OS/2 Bios File
Infinity Game Engine Character Biography
(Baldur's Gate 2 only) [More Info]
.BIP ArcView Image File (band interleaved by pixel)
.BIT Bitmap Image
Worms Armageddon Imported Map
Worms World Party Imported Map
.BIU BidMaker 2002 Update File
(software to aid in making bids on jobs)
.BIX Index to a .BIB BibTeX Bibliography Database
BIX Archiver File (no longer produced)
.BIZ Broderbund Print Shop Business Card File
.BJF NTI Backup NOW! File
.BK Backup
LinguAssist File
JetFax Faxbook File
.BK! Backup
.BK$ Backup
.BK? Backup (Can be 1 to 9, usually with WordPerfect)
.BK1 Bach Preludes and Fugues MIDI akmi Source, Book 1
.BK2 Bach Preludes and Fugues MIDI akmi Source, Book 2
.BKC Collectorz.com Book Collector Database
.BKF Moto Racer Archive [Dragon UnPACKer]
Microsoft WindowsXP Backup Utility
(Note: This is default; can be renamed to any extension.)
.BKG Background File (used in many games/programs)
UWXAFS Binary Format Data File
(absorption data on an energy grid which
does not need to be evenly spaced)
.BKI Backup Index
.BKP Backup
.BKR Bruker Aspect NMR Data File
.BKS Bookshelf Backup
IBM BookManager Read Bookshelf
Microsoft Works Spreadsheet Backup
.BKU Timeslips Backup
.BKW FontEdit Fontset Mirror Image
.BLA Blat E-mail (command line E-mail
tool written for Windows)
.BLB DreamWorks Resource Archive
.BLD BASIC Bload Graphics
MegaPaint [XnView]
VersaPro Block Build Info
.BLEND Blender 3D File
.BLG Windows Binary Performance Log
(W-2000 & W-XP have different formats.
To convert click.)
MicroSim PCBoard Backward ECO Log File
.BLK WordPerfect Temp File
Lightscape Block Library
Alias Wavefront Image
Amiga IFF [XnView]
VersaPro Block
.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!
INPRISE Format Language Library (changed to .BTL)
.BLT Wordperfect for DOS File
Saved AIM Buddy List File
.BLW ArcView World File For BIL Image
.BLZ Bitmap Graphic
Twinkle Bulbs Bulb File
Emblaze.Creator File
Blazon Heraldic Shield
Serial Number File [IBM's Drive
Fitness Test (DFT) program]
.BM Bitmap Graphic
.BM1 Apogee BioMenace Data File
.BMF Corel Flow Image File [XnView]
.BMI Buzz Instrument
Blue Martini Import File (eCRM)
.BMK Help Bookmark
.BML Bean Scripting Framework (BSF) File
(Open with ASCII editor)
.BMP Windows OS/2 Bitmap Graphics [IrfanView]
Infinity Game Engine Palette Information
(Standard graphic file with only one pixel plus color info) [More Info]
.BMS Backup Magic Backup Set
.BMU Music/Sound File [Open with Winamp or other MP3 player]
.BMW Buzz Music File with Waves
.BMX Buzz Music File
Siemens Mobile Phone Animation
.BMZ Demon Stalkers: Raid on Doomfane (old game)
.BN AdLib Instrument Bank
.BN7 Ox Object-Oriented Matrix Programming Language PcGive 7 Data File
.BND Typequick File
.BNG [Used by program RANGER.EXE] (Marshalling Yard Calculations)
.BNK Adlib Instrument Bank
SimCity Game File
(reported to be) Bink Compressed Video/Audio File
.BNL MicroSim PCBoard Netlist File For The Board Layout
.BNR Binary News Reader File
.BNSKIN Beatnik Clock Skin
.BOB BobDown Downloading Program [Also see Antibob]
Bob Raytracer [XnView]
.BOL Microsoft Booasm Compressed Archive Library
.BOM Orcad Schematic Capture Bill of Materials File
Softshare Delta Business Object Model
MicroSim PCBoard Bill of Materials
.BOO Image File
Book
Compressed Archive File
.BOS Brotherhood of Steel Compressed File (renamed ZIP file;
use any extractor)
.BOT Frogbot Editor (Frog = Quake add-on computer opponent)
.BOW Back Orifice 2K Workspace [this is a hacking tool]
.BOX Notes Mailbox
Lemmings Revolution Archive [Dragon UnPACKer]
ThrottleBox Multimedia Viewer
Aladdin Knowledge Systems Vbox Helper Application File
(software distribution)
.BOXR Boxerjam Interactive Game System
.BPC Business Plan Toolkit Chart
BuildPro File
.BPG Borland Project Group (Delphi and C++ Builder)
.BPK C++ Builder Package File
.BPL Delphi Library
Winamp 3 Playlist File
AutoCAD R2000 Batch Plot List File
.BPP MUSICMATCH Burner Plus Project
.BPR Borland C++ Builder 6 Project
BackupXpressPro Project File
.BPS Microsoft Works Document
Bulletproof FTP Settings
.BPT Bitmap Master File
.BPW ArcView World File For BIP Or BMP Images
.BPX Truevision Targa Bitmap [XnView]
.BQW ArcView World File For BSQ Image
.BQY BrioQuery File
.BR Bridge Script
The Playa File (link is tentative)
.BR3 Bryce 3D Scene File
(Bryce made by MetaCreations, changed
to Viewpoint, product taken over by Corel)
.BR4 Bryce 4 File (Bryce made by MetaCreations,
changed to Viewpoint, product taken over by Corel)
.BRC Bryce 2 Scene File (Bryce made by MetaCreations,
changed to Viewpoint, product taken over by Corel)
.BRD EAGLE Board File
.BRF Braille ASCII File [Info Site]
.BRI Basic Rate Interface File
.BRK Brooktrout Fax-Mail File [XnView]
.BRO Tree Professional Broadleaf Creator File
.BRP Tree Professional Broadleaf Creator Image
.BRS Corel Paint Classic File
RoboHELP Browse Sequence
.BRT Brooktrout Fax-Mail File [XnView]
.BRU Brutus Restore File (password cracking)
.BRW Application file associated with financial
institution(s) loan applications (e.g., Calyx Point)
.BRX Multimedia Browsing Index
.BRZ DbBRZ File (Backup or Restore)
.BS Printfox/Pagefox [XnView]
Infinity Game Engine Compiled Script [More Info]
.BS_ Microsoft 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
.BSB SWAT Sub-basin Output File (river basin scale model)
MapInfo Sea Chart
.BSC Apple II Compressed Archive
Source Browser Database
Fortran Pwbrmake Object [FORTRAN]
Boyan Script
Microsoft Developer Studio Browser File
.BSE CRiSP Harvest File
.BSK Bryce 4 File
.BSP Quake Map
Half-life/TFC/CS Map
.BSQ Oracle Control File (SQL.BSQ)
Apple II BINSCII-encoded File (often produces
a Shrinkit .SHK file)
ArcView Image File (band sequential)
.BST BibTeX Style File
Star Trek: Birth of the Federation Structure/Ship
Info File
.BSU Brindys BriTray (software update)
.BSV BASIC Bsave Graphics
.BTAB Base Guitar Tabulature [On-line Guitar Archive]
.BTF Brother Scanner File (supports multiple graphic
pages in one file)
.BTL INPRISE Format Language Library (changed from .BLL)
.BTM 4DOS Batch To Memory Batch File
.BTN ButtonWare File
JustButtons Animated Bitmap [XnView]
.BTO Baytex Organix! 2001 Language Kit
.BTOA Binary-to-ASCII Format (encoding format similar to
.UUE) [Tutorial]
.BTR Btrieve Database File
Microsoft Frontpage-related File [Buy Office XP at
Shop.Microsoft]
.BTS Creative Digital Blaster Digital VCR File
.BTX SEEDIS Index
DB/TextWorks Database Term and Word Indexes
.BUB Photobubble File [Play with Quicktime with Internet
Pictures Corp. iPIX Plugin v6.2 (CrossOver -
npipx32.dll) or Netscape Plugin iPIX Viewer]
.BUD Quicken Backup
.BUF WinXL File (Datascope emulation software)
.BUG Bug (Problem) File
.BUL Holiday Lights Screen Saver Bulb File
.BUM Poser Bump [XnView]
.BUN CakeWalk Audio Bundle File
.BUP Backup DVD Info File
PC-Bibliothek Update File
CD Indexer
Brother Embroidery System File
Softcode Tracker Contact Manager Backup
(Australian software no longer sold)
.BUS Netmino File (SW under development Oct 2002)
.BUT Buttons! Button Definition
.BUY Movie Data File
.BV? WordPerfect Overflow File (Can be 1 to 9)
.BVH Biovision Motion File [Format] (Used by
Poser and other software)
.BVS BVS Solitaire Collection
.BW SGI Black and White Image
Silicon Graphics Raw RGB File [XnView]
.BWB Visual Baler Spreadsheet File
.BWI Blindread/Blindwrite
.BWR Kermit Beware Bug List
.BWS Blindread/Blindwrite
.BWT Blindread/Blindwrite [Fantom CD Emulator]
CDmage Table of Contents
.BWV Business Wave File
.BWZ WinImage Batch Configuration File (make disk images)
.BXB BX-24 Basic Express Compiler Compiled Project
.BXF Man's Best Friend Software Breeder Exchange Format
.BXM BX-24 Basic Express Compiler Map
.BXP BootXP File
BX-24 Basic Express Compiler Module List
.BXX blaxxun Contact
.BYU Movie File (Shockwave)
.BZ Bzip UNIX Compressed File (Open using WinRAR
.BZ2 Bzip UNIX Compressed File (Replaces .BZ) (Open using WinRAR
.BZF Textures and Other Information (used by various games)
.BZN Star Trek Armada Map File
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