| B | Grand Theft Auto 3 Saved Game File | Game Files | 27 | 3 |
| B!K | Microsoft Flight Simulator Scenery File | Data Files | 1 | 1 |
| B00 | Blindwrite Data | Disk Image Files | 2 | 2 |
| B01 | Blindwrite Image Segment |
Disk Image Files
| 1 | 1 |
| B02 | Blindwrite Image Segment |
Disk Image Files
| 1 | 1 |
| B1 | B1 Compressed Archive | Compressed Files | 3 | 3 |
| B1J | BookJones File | Uncommon Files | 1 | 1 |
| B1N | Binary Screen Image File |
Uncommon Files
| 1 | 1 |
| B2 | Progress Database | Database Files | 2 | 1 |
| B25 | Ovation Pro For RISC OS DDL Data |
Data Files
| 1 | 1 |
| B26 | Ovation Pro For RISC OS Style Sheet File |
Data Files
| 1 | 1 |
| B2A | Btoa Encoded File | Encoded Files | 3 | 1 |
| B2D | Brutus2D Source Code File | Developer Files | 1 | 1 |
| B2F | RISC OS Windows Metafile | Vector Image Files | 1 | 1 |
| B2K | Sensible Soccer 2006 Data |
Game Files
| 1 | 1 |
| B2Z | B2Z dVS Model/Object |
Data Files
| 1 | 1 |
| B32 | MS-DOS BCC Data |
Developer Files
| 1 | 1 |
| B3D | Blitz3D Entity Model File | 3D Image Files | 3 | 2 |
| B4 | Helix Nuts And Bolts File |
Data Files
| 1 | 1 |
| B4A | Native Instruments B4 II Data |
Data Files
| 1 | 1 |
| B4F | Burn4Free Project File |
Data Files
| 1 | 1 |
| B4P | Native Instruments B4 II Preset |
Data Files
| 2 | 1 |
| B4S | Winamp Playlist File | Audio Files | 1 | 1 |
| B4U | Visual ReadMe Data File | Text Files | 1 | 1 |
| B5 | MDBG Chinese-English Dictionary Data |
Data Files
| 1 | 1 |
| B5B5 | Unknown File Type |
Uncommon Files
| 1 | 1 |
| B5I | BlindWrite 5 Disk Image |
Disk Image Files
| 3 | 1 |
| B5T | BlindWrite 5 Disc Track Information File |
Disk Image Files
| 3 | 1 |
| B64 | Base64 MIME-Encoded File |
Compressed Files
| 3 | 1 |
| B6I | BlindWrite 6 Disc Image |
Disk Image Files
| 1 | 1 |
| B6T | BlindWrite 6 Track Information File |
Disk Image Files
| 1 | 1 |
| B7S | Unknown File Type |
Uncommon Files
| 1 | 1 |
| B8 | Bitmap Picture File | Raster Image Files | 5 | 1 |
| BA | Scifer External Header Archive |
Compressed Files
| 1 | 1 |
| BAB | Babble! Data File |
Data Files
| 1 | 1 |
| BAC | Backup Plus Backup File | Backup Files | 1 | 1 |
| BACK | RMCProfile Coefficient |
Data Files
| 1 | 1 |
| BACKUP | Google Android Backup File |
Backup Files
| 4 | 4 |
| BACKUP DEFINITION FILE | Backup Definition File |
Backup Files
| 2 | 1 |
| BAD | Exchange Badmail File |
Text Files
| 2 | 2 |
| BAF | BioWare Infinity Game Engine Script |
Game Files
| 4 | 2 |
| BAH | BioWare Infinity Game Engine Data |
Game Files
| 1 | 1 |
| BAI | BUILD2WIN Add-in | Plugin Files | 2 | 2 |
| BAI2 | Cash Management Balance Reporting Specifications Version 2 |
Data Files
| 1 | 1 |
| BAK | General Backup File |
Backup Files
| 23 | 21 |
| BAL | Borland Programming Language Source Code |
Data Files
| 2 | 2 |
| BALL | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| BAM | Bob's Adlib Music File Format |
Audio Files
| 3 | 3 |
| BAN | Sierra Print Artist Banner File | Graphic Files | 1 | 1 |
| BAND | GarageBand Project File |
Audio Files
| 1 | 1 |
| BANK | Darkest Dungeon Sound Data |
Game Files
| 1 | 1 |
| BANNER | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| BAO | Unknown File Type |
Uncommon Files
| 1 | 1 |
| BAP | Blaze Audio Wave Information File |
Audio Files
| 1 | 1 |
| BAR | BlackBerry OS 10 Application Installation Package |
Compressed Files
| 10 | 6 |
| BAR FILE EXTENSION | BlackBerry OS 10 Application Installation Package |
Compressed Files
| 1 | 1 |
| BAS | BASIC Source Code File |
Developer Files
| 3 | 1 |
| BASE | BioArray Software Environment (BASE) Data File |
Data Files
| 1 | 1 |
| BASH | Unix Bourne Shell (Bash) Script |
Developer Files
| 5 | 1 |
| BASIN | HEC-HMS Basin Model Settings File | Settings Files | 1 | 1 |
| BAT | DOS Batch File | Executable Files | 4 | 1 |
| BATCH | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
Data Files
| 3 | 1 |
| BATH | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| BAU | Apache OpenOffice AutoText File |
Settings Files
| 1 | 1 |
| BAV | AVG Bat! Plugin File |
Plugin Files
| 1 | 1 |
| BAY | Casio RAW Image | Camera Raw Files | 3 | 2 |
| BAZ | Acomba Accounting Suite Backup |
Backup Files
| 2 | 2 |
| BB | Blitz Source Code File |
Developer Files
| 1 | 1 |
| BB2 | XBBS-OS/2, XGROUP, AV, ZTree Archiver Control Data File |
Data Files
| 1 | 1 |
| BBB | BlackBerry Mobile Phone Backup File |
Backup Files
| 3 | 1 |
| BBC | BBC BASIC Data File |
Developer Files
| 1 | 1 |
| BBD | Xilinx Black Box Definition |
Settings Files
| 1 | 1 |
| BBE | Brainbloom Document Exchange File |
Text Files
| 1 | 1 |
| BBF | ScriptBasic Compiled Binary File |
Developer Files
| 1 | 1 |
| BBG | CyberSports For Basketball Game File |
Game Files
| 1 | 1 |
| BBK | TreePad Backup File |
Backup Files
| 1 | 1 |
| BBL | BibTeX Generated Bibliography File |
Text Files
| 6 | 2 |
| BBM | Deluxe Paint Bitmap Image File |
Data Files
| 3 | 1 |
| BBRKPUZZLE | BrainsBreaker Puzzle Data File |
Game Files
| 1 | 1 |
| BBS | Bulletin Board System Text |
Text Files
| 4 | 1 |
| BBT | BTwin Local Database File |
Database Files
| 2 | 2 |
| BBU | BossBackup2 Backup Set |
Data Files
| 1 | 1 |
| BBV | PPLive Cache File | Video Files | 1 | 1 |
| BBZ | Bitblaze Audio File |
Audio Files
| 3 | 3 |
| BC | BitComet Partially Downloaded File |
Uncommon Files
| 2 | 2 |
| BC! | BitComet Incomplete File |
Uncommon Files
| 1 | 1 |
| BC3 | FIEBDC Database |
Data Files
| 1 | 1 |
| BCA | Allplan Backup Catalog File |
Backup Files
| 2 | 2 |
| BCC | Calendar Creator File |
Data Files
| 2 | 2 |
| BCD | Windows Boot Configuration Data File | System Files | 5 | 3 |
| BCE | ArchiCAD File | CAD Files | 1 | 1 |
| BCF | Business Card Designer Pro File | Page Layout Files | 1 | 1 |
| BCH | dBASE Batch Process Object |
Data Files
| 1 | 1 |
| BCI | Belarc Advisor Report File |
Data Files
| 2 | 1 |
| BCK | VMX Backup File |
Backup Files
| 2 | 2 |
| BCKP | Ad-Aware Quarantined File |
Backup Files
| 1 | 1 |
| BCL | Illumina Base Call File |
Data Files
| 1 | 1 |
| BCM | Adobe Bridge Cache File |
Data Files
| 3 | 3 |
| BCN | Business Card Design File |
Graphic Files
| 1 | 1 |
| BCO | Bitstream Outline Font Description File | Font Files | 1 | 1 |
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