| Extension | File Type | Files scanned | Contributor |
| B | BundleFile | 3 | |
| B | GTA: San Andreas save game (v1 PS2) | 1 | |
| B | GTA: San Andreas save game (v1.00 PC mod) | 1 | |
| B | GTA: San Andreas save game (v1.00 PC) | 1 | |
| B | GTA: San Andreas save game (v1.01 PC mod) | 1 | |
| B | GTA: San Andreas save game (v1.01 PC) | 1 | |
| B | GTA: San Andreas save game (v2 PS2) | 1 | |
| B | GTA: San Andreas save game (v2.00 PC German) | 1 | |
| B | GTA: San Andreas save game (v2.00 PC) | 1 | |
| B2Z | B2Z dVS Model/Object | 18 | |
| B3D | Blitz3d object | 2 | |
| B5T/B6T | BlindWrite TOC | 3 | |
| B8 | Cubicomp PictureMaker blue channel image data | 15 | |
| BAD | Brutus Application Definition | 18 | |
| BADONGO | BaDonGo file info | 3 | |
| BAG | AOL Instant Messenger buddy list | 14 | |
| BAG | Bag archive | 6 | |
| BAS | BAS VBDOS Pro 1.0 Source | 22 | |
| BAS | CHDK UBASIC script | 12 | |
| BAS | CHDK UBASIC script (with rem) | 14 | |
| BAS | GW-BASIC protected source | 3 | |
| BAS | GW-BASIC source | 5 | |
| BAS | HBasic source code | 24 | |
| BAS | Microsoft QuickBASIC 4.5 source module | 88 | Dario Messina |
| BAS | QuickBASIC Extended v7.1 Source | 46 | |
| BASIN | HEC-HMS Basin model settings | 3 | |
| BAV | The Bat! Antivirus plugin | 18 | |
| BAW | BrainLED AlfaWave session | 4 | |
| BBF | ScriptBasic Binary File Format (32bit) | 2 | |
| BBF | ScriptBasic Binary File Format (64bit) | 2 | |
| BBX | BrainBox neural net | 15 | |
| BC | Big Crunch compressed file | 4 | |
| BC | LLVM Bytecode | 2 | |
| BC | LLVM Bytecode (compressed) | 2 | |
| BCA | Jetico BCArchive encrypted archive | 2 | |
| BCF | Belltech Business Card Designer Pro | 2 | |
| BCK | BackupExpress Pro | 71 | Christian Wolkersdorfer |
| BCS | BCS Video | 3 | |
| BCS | Yamaha Basic Style | 98 | |
| BD | Benn Daglish Music | 27 | |
| BDC | Babylon Dictionary | 29 | r0bb3r.xXx |
| BDF | Brother Embroidery File | 4 | |
| BDF | UNIX font | 22 | |
| BDIC | Google Chrome dictionary | 2 | |
| BDL | GameCube 3d model | 2 | |
| BDR | Microsoft Border art | 15 | |
| BEE | The Bee Archiver compressed archive | 6 | |
| BF | Cryo Interactive gamedata | 2 | |
| BFA | Blowfish Advanced CS encrypted | 10 | |
| BFLI | Big Flexible Line Interpretation (C64) bitmap | 20 | |
| BFN | Brother Embroidery System Font | 2 | |
| BFX | Bitware BitFax page(s) | 22 | |
| BGA | OS/2 Bitmap Graphics Array | 20 | |
| BGDB | Global Virtual Accademy e-learning file | 7 | |
| BGI | Borland Graphics Interface printer driver | 16 | |
| BGI | Borland Graphics Interface video driver | 14 | |
| BGL | Babylon Glossary | 40 | r0bb3r_xXx |
| BH | BlackHole compressed archive | 4 | |
| BHF | PCAnywhere32 Data | 3 | |
| BIB/TXT | BibTeX file | 15 | |
| BIF | TomTom Go info | 3 | |
| BIF | TomTom Navigator info | 3 | |
| BIF | TomTom info (generic) | 6 | |
| BIG | 'Electronic Arts' Game Archive | 31 | voodooattack |
| BIG | SGA archive - Home World 2 game data | 4 | |
| BIK | Bink Video | 10 | |
| BIN | AVG update package | 5 | |
| BIN | GPS Tracklog (MTK Chipset) | 4 | Josef Schneider |
| BIN | JetFighter 2015 savegame | 68 | |
| BIN | Sega Genesis / Megadrive / 32x ROM image | 13 | Piwi |
| BIN/BLI | Thomson Speedtouch serie WLAN router firmware | 11 | |
| BIO | BioArk compressed archive | 6 | |
| BIX | BIX Archiver compressed archive | 8 | |
| BIZ | BIZ dVS Model/Object | 43 | |
| BIZ | PrintMaster Gold document | 10 | |
| BKF | WindowsXP Backup Utility backup set | 7 | |
| BKG/GUL | Samsung document | 15 | |
| BKI | IBM Softcopy Reader (Bookmanager) Bookshelf (and Book) index file | 3 | |
| BKR | ReplaceEm fileset | 9 | |
| BKS | IBM Softcopy Reader (Bookmanager) book file | 4 | |
| BLB | DreamWorks Resource, Music, Sound | 5 | |
| BLD | 3D Home Design Suite model | 40 | |
| BLEND | Blender 3D file | 19 | |
| BLI | BLINK compressed archive | 4 | |
| BLOB | Cosmic Blobs model | 10 | |
| BLOB | Steam Registry | 8 | Jocker |
| BLP | Blizzard Picture (type 1) | 12 | |
| BLP | Blizzard Picture (type 2) | 4 | |
| BLT | Saved AIM Buddy List | 13 | |
| BLU | Apple Binary 2 Library Utility archive | 5 | |
| BLUE | EVE Online data (generic) | 4 | |
| BLZ | BriefLZ compressed data | 18 | Label |
| BMA | BMA Archiver compressed archive | 3 | |
| BMD | GameCube 3d model (texture + skeleton) | 2 | |
| BMF | BMF v1.x bitmap | 92 | |
| BMF | BMF v2.x bitmap | 14 | |
| BMF | ByteMap font format | 2 | |
| BMF | Corel Binary Material Format | 13 | |
| BMF | FloorPlan 3D project | 6 | |
| BMP | AWBM Award BIOS bitmap | 5 | |
| BMP | Windows Bitmap | 172 | |
| BND | DB2 Bind File | 40 | Roberto 'rbnet' Bolli |
| BNK | Adlib instruments/sound bank | 4 | |
| BNK | ExamView Question Bank | 27 | |
| BOA/B** | BOA Constrictor Archiver compressed archive | 5 | |
| BONK | BONK lossless/lossy audio compressor | 22 | James Heinrich |
| BOOK | FrameMaker book | 4 | |
| BOOK | ICE Book Reader Book File | 10 | .Cryorb |
| BOOTSKIN | BootSkin Vista theme | 5 | |
| BOOTSKIN | BootSkin theme | 8 | |
| BOT | Soldat Bot Information | 100 | |
| BP | SoundMon 2.0 Music | 17 | |
| BPD | Buero Plus NexT FlashFiler database file | 86 | Meigel |
| BPD | Business Plan data | 9 | |
| BPR | C++ Builder XML Project | 23 | |
| BQY | BrioQuery | 13 | |
| BR6 | Bryce 6 Scene | 3 | |
| BRD | EAGLE PCB (circuit board) drawing | 51 | Renan (aka Wizard) |
| BRSTM | BRST Audio Stream | 8 | |
| BS/BIN | PrintFox (C64) bitmap | 13 | |
| BSB | MapInfo Sea Chart | 14 | |
| BSC | BinSCII encoded file | 7 | |
| BSN | BSA Packing program compressed archive | 7 | |
| BSP | Counter-Strike : Source map | 13 | Thaimodz |
| BSP | GETIC 3D BSP | 2 | |
| BSP | Quake Map | 21 | |
| BSP | Quake2 map | 23 | fenixproductions |
| BSZ | BSplayer Skin | 8 | |
| BT | BluffTitler Show | 366 | Ryan Jones |
| BT | VTBuilder - Binary Terrain (generic) | 10 | |
| BT | VTBuilder - Binary Terrain v1.x | 10 | |
| BTD | Power To-Do List Data | 5 | |
| BTG | Binary TerraGear - FlightGear scenary data | 16 | |
| BTPC | BTPC encoded bitmap | 3 | |
| BTR | FrontPage Binary-tree index | 14 | |
| BTX | DB/TextWorks Database Term and Word Index | 16 | |
| BVD | BvD fileset | 2 | |
| BVH | Motion Capture File | 144 | Alex Paven |
| BW | Silicon Graphics B/W bitmap | 5 | |
| BWE | Black and White 2 Environment data | 15 | |
| BWG | BrainWave Generator | 82 | kif aka AC |
| BWS | Photo Enote (Enot) external photo viewer settings | 5 | |
| BWW | Bagpipe notation | 9 | |
| BXB | BasicX compiled bytecode | 4 | |
| BXU | PictureGear Studio file | 9 | |
| BXY | NuFX archive (with Binary II header) | 18 | |
| BZ2 | bzip2 compressed archive | 9 | |
| BZA | BZA compressed archive | 3 | |
