| .B | Rockstar Games | Arquivos de jogos | Grand Theft Auto 3 Saved Game File | Grand Theft Auto III | Rockstar Games |
| .B1 | The Catalina Group | Arquivos de jogos | B1 Compressed Archive | B1 Free Archiver | The Catalina Group |
| .B2K | Sensible Software | Arquivos de jogos | Sensible Soccer 2006 Data | Sensible Soccer | Sensible Software |
| .BAF | BioWare | Arquivos de jogos | BioWare Infinity Game Engine Script | Baldur's Gate | BioWare |
| .BAH | BioWare | Arquivos de jogos | BioWare Infinity Game Engine Data | Baldur's Gate | BioWare |
| .BAM | Broad Institute | Arquivos de jogos | Bob's Adlib Music File Format | Nullsoft Winamp | Nullsoft |
| .BANK | Red Hook Studios | Arquivos de jogos | Darkest Dungeon Sound Data | Darkest Dungeon | Red Hook Studios |
| .BAR | BlackBerry | Arquivos de jogos | BlackBerry OS 10 Application Installation Package | Blackberry 10 | BlackBerry |
| .BBG | CyberSports Ltd | Arquivos de jogos | CyberSports For Basketball Game File | CyberSports for Basketball | CyberSports Ltd |
| .BBRKPUZZLE | Juan Trujillo / JTTSoft | Arquivos de jogos | BrainsBreaker Puzzle Data File | BrainsBreaker | Juan Trujillo / JTTSoft |
| .BBZ | BitBlaze | Arquivos de jogos | Bitblaze Audio File | Unknown Software | Unknown Developer |
| .BCS | The Wavelength | Arquivos de jogos | Batch Compiler Specification File | Batch Compiler | The Wavelength |
| .BD1 | Unknown Developer | Arquivos de jogos | X Operations Map Block Location | X Operations | Unknown Developer |
| .BDF | Willowsoft Creek Software | Arquivos de jogos | Backup Definition File | Backup Made Simple | Willowsoft Creek Software |
| .BDP | Microsoft Corporation | Arquivos de jogos | Exchange Diagnostic Message | Microsoft Exchange Server | Microsoft Corporation |
| .BEJEWELED2DELUXESAVEDGAME | Big Fish Games, Inc | Arquivos de jogos | Bejeweled 2 Deluxe Saved Game | Bejeweled 2 Deluxe | PopCap Games |
| .BEX | Symantec Corporation | Arquivos de jogos | PGP Binary Extracted Public Key | Pretty Good Privacy (PGP) | Symantec Corporation |
| .BF | Cryo Interactive Entertainment | Arquivos de jogos | CryoBF Game Data File | XpoZed's Unpakke | nullsecurity organization |
| .BFB | Microsoft Corporation | Arquivos de jogos | Zoo Tycoon 2 Model File | Zoo Tycoon 2 | Microsoft Corporation |
| .BFG | Big Fish Games, Inc | Arquivos de jogos | Big Fish Games Application File | Big Fish Games Game Manager | Big Fish Games, Inc |
| .BFL | XnSoft | Arquivos de jogos | BFLI Image Format | XnView MP | XnSoft |
| .BFM | Terminal Reality | Arquivos de jogos | Terminal Reality Model File | BloodRayne | Terminal Reality |
| .BFS | Bugbear Entertainment | Arquivos de jogos | FlatOut Game Data File | FlatOut | Bugbear Entertainment |
| .BGL | Babylon Software Ltd. | Arquivos de jogos | Babylon Glossary File | Babylon | Babylon Software Ltd. |
| .BIC | Take-Two Interactive | Arquivos de jogos | Civilization 3 Scenario File | Civilization | Take-Two Interactive |
| .BIF | MagicISO Inc. | Arquivos de jogos | Boot Information File | MagicISO | MagicISO Inc. |
| .BIFF | BioWare | Arquivos de jogos | BioWare Infinity Engine Archive Of Resources | Baldur's Gate | BioWare |
| .BIG | Electronic Arts | Arquivos de jogos | Electronic Arts Game Data File | Dragon UnPACKer | Open Source |
| .BIKEY | Bohemia Interactive | Arquivos de jogos | Bohemia Interactive Key | ArmA: Armed Assault | Bohemia Interactive |
| .BIN | Unknown Developer | Arquivos de jogos | Binary Disk Image File | IsoBuster | Smart Projects |
| .BIO | IBM | Arquivos de jogos | BIOS File | Intel Integrator Toolkit | Intel Corporation |
| .BIQ | Take-Two Interactive | Arquivos de jogos | Civilization 3 Scenario File | Civilization | Take-Two Interactive |
| .BIX | Take-Two Interactive | Arquivos de jogos | Civilization 3 Scenario File | Civilization | Take-Two Interactive |
| .BKG | Samsung Electronics | Arquivos de jogos | Samsung Document | Unknown Software | Unknown Developer |
| .BLB | SourceForge | Arquivos de jogos | Interactive Fiction Package Game File | Windows Frotz | SourceForge |
| .BLN | Big Huge Games | Arquivos de jogos | Rise Of Nations Campaign Media File | Rise Of Nations | Big Huge Games |
| .BLP | Blizzard Entertainment Inc. | Arquivos de jogos | Blizzard Texture File | Warcraft III | Blizzard Entertainment Inc. |
| .BLS | Interscape | Arquivos de jogos | Blockland Saved Game File | BlockLand | Interscape |
| .BLY | Electronic Arts | Arquivos de jogos | FIFA World Cup Game Data | FIFA World Cup | Electronic Arts |
| .BLZ | Nokia | Arquivos de jogos | N-Gage Mobile Video Game File | Nokia PC Suite | Nokia |
| .BM2 | DynaVox Mayer-Johnson | Arquivos de jogos | Boardmaker Interactive Board File | DynaVox Mayer-Johnson Boardmaker | DynaVox Mayer-Johnson |
| .BMD | Webzen | Arquivos de jogos | MU Online Game Data File | Webzen MU Online | Webzen |
| .BME | KONAMI | Arquivos de jogos | BeatMania 7-Key Song File | Beatmania | KONAMI |
| .BMG | Nintendo | Arquivos de jogos | Nintendo DS On-Screen Text File | MKDS Course Modifier | Gericom |
| .BMS | KONAMI | Arquivos de jogos | BeatMania Song File | StepMania | Open Source |
| .BMZ | Valve | Arquivos de jogos | Portal Bonus Map Zip File | Portal 2 | Valve |
| .BND | IBM | Arquivos de jogos | DB2 CLI Bind File | IBM DB2 | IBM |
| .BNK | Unknown Developer | Arquivos de jogos | Adlib Instrument Bank | Adlib Tracker II | Adlib Tracker II |
| .BNT | MindArk | Arquivos de jogos | Entropia Universe Game Archive | Entropia Universe | MindArk |
| .BOD | Egosoft GmbH | Arquivos de jogos | X3 Reunion Ship File | X³: Reunion | Egosoft GmbH |
| .BOL | Nintendo | Arquivos de jogos | Mario Kart Course Setup File | Mario Kart Wii | Nintendo |
| .BOS | IBM | Arquivos de jogos | Build Options Specification File | IBM Rational ClearCase | IBM |
| .BOT | id Software | Arquivos de jogos | Quake 3 Arena Bot AI Data File | Quake 3 Arena | id Software |
| .BPE | 2K Sports | Arquivos de jogos | WWE Texture Archive | WWE 2k15 | 2K Sports |
| .BPS | Symantec Corporation | Arquivos de jogos | BPS Programs Virus File | Kaspersky Anti-Virus | Kaspersky Lab |
| .BRN | BrainStorm Software | Arquivos de jogos | BrainStorm Data File | BrainStorm | BrainStorm Software |
| .BS | BioWare | Arquivos de jogos | Infinity Game Engine Compiled Script File | Baldur's Gate | BioWare |
| .BSA | Bethesda Softworks | Arquivos de jogos | Bethesda Softworks Archive | BSA Commander | Open Source |
| .BSB | Take-Two Interactive | Arquivos de jogos | BioShock Saved Game File | BioShock | Take-Two Interactive |
| .BSG | Spiderling Games | Arquivos de jogos | Besiege Game Data | Besiege | Spiderling Games |
| .BSM | Take-Two Interactive | Arquivos de jogos | Bioshock Map Data | BioShock | Take-Two Interactive |
| .BSP | id Software | Arquivos de jogos | Quake Engine Game Map File | GtkRadiant | id Software |
| .BUN | Roland Corporation | Arquivos de jogos | Cakewalk Bundle File | Cakewalk SONAR | Cakewalk, Inc. |
| .BUS | VirtualBus.info | Arquivos de jogos | VirtualBus Bus Route Settings File | VirtualBus (vBus) | VirtualBus.info |
| .BWA | VSO Software | Arquivos de jogos | BlindWrite Disk Information File | BlindWrite | VSO Software |
| .BWE | Lionhead Studios | Arquivos de jogos | Black and White 2 Environment Data | Black & White | Lionhead Studios |
| .BZF | Unknown Developer | Arquivos de jogos | Game File | Unknown Software | Unknown Developer |
| .BZW | Interscape | Arquivos de jogos | BZFlag World File | BZFlag | Interscape |
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