File extension	The full name of the file	Popularity
File extension B	IBM Lotus applause batch list file
File extension B1	B1 Compressed Archive
File extension B2A	Btoa Encoded File
File extension B3D	BodyPaint 3D format
File extension B4S	Winamp Playlist File
File extension B5I	BlindWrite image file
File extension B5T	BlindWrite image file
File extension B64	Base64 MIME-Encoded File
File extension B6I	BlindWrite 6 Disc Image
File extension B6T	BlindWrite 6 Track Information File
File extension BA	Scifer External Header Archive
File extension BAC	Backup File
File extension BACKUP	Backup of current ISAPI application
File extension BACKUPDB	Apple Time Machine backup folder file
File extension BAD	Exchange Badmail File
File extension BAFL	BurnAware File List
File extension BAK	Backup File
File extension BAK~	AbiWord Auto-Saved Document
File extension BAND	GarageBand Project File
File extension BAP	Blaze Audio Wave Information File
File extension BAR	Age of Empires 3 Data File
File extension BAS	BASIC Source Code File
File extension BASERPROJ	DNA Baser Project File
File extension BASEX	BaseX Data File
File extension BASHRC	Bash Non-Interactive Login Shell File
File extension BASH_HISTORY	Bash History File
File extension BASH_PROFILE	Bash Interactive Login Shell File
File extension BAT	Batch file (executable)
File extension BAU	Apache OpenOffice AutoText File
File extension BAV	AVG Bat! Plugin File
File extension BAY	Casio RAW Image
File extension BA_	Renamed BAT File
File extension BB	Blitz Source Code File
File extension BB3	BlasterBall 3 Level File Support
File extension BBB	BlackBerry backup (post 2012) file
File extension BBC	BBC BASIC Data File
File extension BBCD	BobCAD-CAM Document
File extension BBL	TeX/BibTeX bibliographic reference file
File extension BBLM	BBEdit Language Module
File extension BBPROJECT	BBEdit Project File
File extension BBPROJECTD	BBEdit Project Document
File extension BBS	Bulletin Board System Text
File extension BBZ	BerryBuzz Backup File
File extension BC	BitComet Partially Downloaded File
File extension BC!	BitComet Incomplete File
File extension BCC	Borland C++ file/makefile
File extension BCD	Windows Boot Configuration Data File
File extension BCF	Business Card Designer Pro File
File extension BCI	Belarc Advisor Report File
File extension BCK	VMX Backup File
File extension BCKP	Ad-Aware Quarantined File
File extension BCL	Illumina Base Call File
File extension BCM	Business Contact Manager File
File extension BCMX	Business Contact Manager Customization
File extension BCP	Borland C++ Makefile
File extension BCS	Boland Calibration Settings File
File extension BCT	Adobe Bridge Thumbnail Cache File
File extension BDAE	Gameloft Game Data File
File extension BDB	Microsoft Works Database Backup File
File extension BDC	Babylon Dictionary File
File extension BDD	CARA Sound Radiation Data File
File extension BDF	Glyph Bitmap Distribution Format
File extension BDIC	Chrome Dictionary File
File extension BDL	CoCreate Bundle File
File extension BDM	AVHCD Information File
File extension BDMV	Blu-ray information file
File extension BDP	Exchange Diagnostic Message
File extension BDR	Exchange Non-Delivery Report Body File
File extension BDSPROJ	BDS project file
File extension BDT2	BEEDOCS Timeline 3D 2 Document
File extension BDT3	BEEDOCS Timeline 3D 3 Document
File extension BEAM	Compiled Erlang File
File extension BEAN	Bean Rich Text Document
File extension BED	UCSC BED Annotation Track File
File extension BEJEWELED2DELUXESAVEDGAME	Bejeweled 2 Deluxe Saved Game
File extension BET	BETA Source File
File extension BF	CryoBF Game Data File
File extension BFA	Blowfish Encrypted File
File extension BFC	Windows Briefcase File
File extension BFF	Backup File Format
File extension BFG	Big Fish Games Application File
File extension BFM	Terminal Reality Model File
File extension BFS	FlatOut Game Data File
File extension BFX	Bitware Fax Document
File extension BGI	BgInfo Configuration File
File extension BGL	Flight Simulator Scenery File
File extension BGT	Graphics Accounts Data File
File extension BGZ	Blood Frontier Map File
File extension BH	BlakHole Archive
File extension BHO	Behold Organize File
File extension BHX	BinHex Encoded File
File extension BIB	BibTeX Bibliography Database
File extension BIC	Civilization 3 Scenario File
File extension BIDULE	Bidule Layout File
File extension BIF	BioWare Infinity Engine File
File extension BIFX	Get Backup Project
File extension BIG	Electronic Arts Game Data File
File extension BIK	BINK video file
File extension BIL	ESRI BIL File
File extension BIM	Bytessence InstallMaker Document
File extension BIN	Binary Disc Image
File extension BIO	Mudbox Bio 3D File
File extension BIONIX	Bionix Wallpaper list file
File extension BIP	Character Studio Biped File
File extension BIQ	Civilization 3 Scenario File
File extension BIT	Xilinx Bitstream File
File extension BITPIM	BitPim Configuration File
File extension BIX	Civilization 3 Scenario File
File extension BIZ	Broderbund Business Card File
File extension BJO	TabRite Tablature File
File extension BK	FrameMaker Book File
File extension BK1	Autodesk Backup File
File extension BK2	Windows Indexing Service Data File
File extension BKC	Backup4all catalog file
File extension BKF	Windows Backup Utility File
File extension BKK	BookBuddi eBook File
File extension BKMK	Yummy FTP Bookmark File
File extension BKP	Backup File
File extension BKS	NTBackup Settings File
File extension BKUP	Backup File
File extension BKZ	FileFort backup
File extension BLACKHAWKSTRIKER2	Blackhawk Striker 2 Saved Game
File extension BLASTERBALL3SAVEDGAME	BlasterBall 3 Saved Game
File extension BLB	Blob Data File
File extension BLD	MegaPaint picture image file
File extension BLEND	Blender 3D Data File
File extension BLEND1	Blender Document Backup File
File extension BLEND2	Blender Document Backup 2 File
File extension BLF	Microsoft Windows Vista and Windows 7 registry file
File extension BLG	Windows Binary Performance Log File
File extension BLI	Thomson Speedtouch Firmware File
File extension BLK	AutoCAD Block Template File
File extension BLKRT	Block Artist Image File
File extension BLN	Golden Software Blanking File
File extension BLOB	Valve Steam Archive
File extension BLOCKPLT	LEGO MINDSTORMS NXT Block Palette File
File extension BLOGTHIS	Windows Live Writer Data File
File extension BLP	Blizzard Texture File
File extension BLS	Blockland Saved Game File
File extension BLT	AIM Buddy List
File extension BLU	FileMaker Pro Runtime Extension
File extension BLW	Adobe Photoshop Black and White Presets File
File extension BLZ	N-Gage Mobile Video Game File
File extension BM2	Subspace Bitmap File
File extension BM3	Sony Ericsson Backup File
File extension BMC	Bitmap Cache File
File extension BMD	MU Online Game Data File
File extension BME	BeatMania 7-Key Song File
File extension BMF	Binary Material File
File extension BMG	Mario Kart Wii message file
File extension BMI	3ds Max Plug-in
File extension BMK	PowerDVD MovieMark File
File extension BML	Bean Markup Language File
File extension BMP	Bitmap Image File
File extension BMS	BeatMania Song File
File extension BMX	Siemens Mobile Animations File
File extension BMZ	Compressed bitmap file
File extension BNA	Atlas Boundary file
File extension BND	Neighbours From Hell game archive
File extension BNDL	Game Data Bundle File
File extension BNG	The Bingo Maker Card File
File extension BNK	Test Drive Unlimited Data Package
File extension BNP	Sony Camcorder Video Data File
File extension BNS	Portal script file
File extension BNZ	The Bingo Maker Card Template File
File extension BOC	EasyWord Big Document
File extension BOK	TestGen Testbank File
File extension BOM	Mac OS X Bill of Materials File
File extension BONK	Bonk Audio File
File extension BOO	Booasm Compressed Archive
File extension BOOK	FrameMaker Book File
File extension BOOKTEMPLATE	iBooks Author Document Template
File extension BOOKWORMDELUXESAVEDGAME	Bookworm Deluxe Saved Game
File extension BOOT	InstallShield file
File extension BOOTSKIN	Stardock Bootskin File
File extension BOX	E-mail Mailbox
File extension BP2	AutoCAD Batch Plot File
File extension BP3	AutoCAD Batch Plot File
File extension BPA	StorageSync Backup Archive
File extension BPB	PowerDesigner Business Process Backup File
File extension BPD	Business Plan Pro Document
File extension BPDX	Acrobat Batch PDX File
File extension BPF	BatchPhoto profile file
File extension BPG	Borland Project Group
File extension BPK	Nero SecurDisc Public Key File
File extension BPL	AutoCAD Batch Plot File
File extension BPM	Trados AutoSuggest Dictionary File
File extension BPN	ArchiCAD Project Backup File
File extension BPNUEB	PNU eBook File
File extension BPR	Borland C++Builder Project File
File extension BPS	BPS Virus File
File extension BPW	Bitser Password File
File extension BPZ	Easy Blue Print Symbol Library
File extension BQY	Brio Query File
File extension BR3	Bryce 3 Scene File
File extension BR4	Bryce 4 Scene File
File extension BR5	Bryce 5 Scene File
File extension BR6	Bryce 6 Scene File
File extension BR7	Bryce 7 Scene File
File extension BRAIN	PersonalBrain Mind Map File
File extension BRD	EAGLE Circuit Board File
File extension BRF	Braille Ready Format File
File extension BRG	ProjectWise User Settings File
File extension BRI	Bryce Plug-in File
File extension BRK	Brooktrout fax file
File extension BRLYT	Wii Textures and Material Lists File
File extension BRM	Bryce Plug-in File
File extension BRN	BrainStorm Data File
File extension BRO	CreataCard Brochure Project
File extension BROWSER	ASP.NET Browser Definition File
File extension BRRES	Wii BRRES Resource Package
File extension BRS	RoboHelp Browse Sequence File
File extension BRSAR	Wii BRSAR Audio Package
File extension BRSTM	BRSTM Audio Stream File
File extension BRT	Booria Carpet Designer robotuft project
File extension BRW	PointCentral Financial institutions loan file
File extension BRX	BREW Application Resource File
File extension BS1	VirtualBus Vehicle Configuration File
File extension BS2	BASIC Stamp 2 Code File
File extension BS4	Mikogo Session Video Recording
File extension BS7	Windows 7 Boot Updater Skin
File extension BSA	Bethesda Softworks Archive
File extension BSB	MapInfo sea chart file
File extension BSC	Visual Studio Source Browser Information File
File extension BSD	BSDL File
File extension BSDL	Boundary Scan Description Language File
File extension BSF	Blu-ray AVC Video File
File extension BSH	BeanShell Script
File extension BSK	Nero SecurDisc Private Key File
File extension BSP	Quake Engine Game Map File
File extension BSS	Resident Evil Background Images File
File extension BST	BibTeX Style Document
File extension BT	Binary Terrain File
File extension BT!	BitSpirit Incomplete Download File
File extension BTAPP	uTorrent App
File extension BTD	Business-in-a-Box Document
File extension BTF	NationsBank Check Images
File extension BTI	Nintendo Texture File
File extension BTIF	NationsBank Check Image File
File extension BTINSTALL	uTorrent Installer File
File extension BTM	BizTalk Map File
File extension BTN	Just Buttons animated bitmap image file
File extension BTO	Bryce Tree File
File extension BTOA	Binary-to-ASCII Encoded File
File extension BTR	Btrieve Database File
File extension BTSEARCH	BitTorrent Search Engine File
File extension BTW	BarTender Label
File extension BUD	Binary Printer Description File
File extension BUF	Buffer File
File extension BUILDPATH	Eclipse XML build path file
File extension BUN	Cakewalk Bundle File
File extension BUNDLE	Mac OS X Application plug-in
File extension BUP	DVD IFO Backup File
File extension BUR	BuRg3r Source Code File
File extension BUS	VirtualBus Board Parameters File
File extension BVD	Bitdefender Vault File
File extension BVH	Biovision Hierarchy Animation File
File extension BVP	Bluevoda Website Builder file
File extension BVR	Blue Iris Video
File extension BWA	BlindWrite Disk Information File
File extension BWF	Broadcast Wave File
File extension BWG	BrainWave Generator Audio File
File extension BWI	BlindWrite CD/DVD Disc Image
File extension BWP	BuRg3r Web Page
File extension BWS	BlindWrite Sub Code File
File extension BWT	BlindWrite 4 Disk Image
File extension BWW	Bagpipe Player File
File extension BWZ	WinImage Batch Configuration File
File extension BXL	Accelerated Designs PCB Library File
File extension BXX	BS Contact Parameter File
File extension BYU	Movie.BYU geometry file
File extension BZ	Bzip Compressed File
File extension BZ2	Bzip2 Compressed File
File extension BZA	IZArc BGA Archive
File extension BZABW	Compressed AbiWord Document
File extension BZIP	Bzip Compressed Archive
File extension BZIP2	Bzip2 Compressed Archive
File extension BZW	BZFlag World File