| .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 |
| .C16 | Creature Labs | Arquivos de jogos | C16 Creatures 3/Docking Station Image | Creature Labs Creatures | Creature Labs |
| .C4S | RedWolf Design | Arquivos de jogos | Clonk Game Scenario File | Clonk Game | RedWolf Design |
| .C4U | Open Source | Arquivos de jogos | OpenClonk Update System File | OpenClonk | Open Source |
| .C4V | RedWolf Design | Arquivos de jogos | Clonk Game Video File | Clonk Game | RedWolf Design |
| .CAR | Unknown Developer | Arquivos de jogos | Car Explorer Data File | Car Explorer | Unknown Developer |
| .CARD | GameHouse | Arquivos de jogos | Funkiball Adventure Game File | Funkiball Adventure | GameHouse |
| .CBF | Tailwag Software | Arquivos de jogos | Calendar Builder File | Calendar Builder | Tailwag Software |
| .CBH | ChessBase GmbH | Arquivos de jogos | ChessBase Database Header File | ChessBase Reader | ChessBase GmbH |
| .CBS | Pelican Accessories | Arquivos de jogos | Code Breaker PS2 Save File | Mymc | Open Source |
| .CBV | ChessBase GmbH | Arquivos de jogos | ChessBase Database File | ChessBase Reader | ChessBase GmbH |
| .CCH | Microsoft Corporation | Arquivos de jogos | .NET Security Resolution Cache File | Microsoft .NET Framework | Microsoft Corporation |
| .CDP | Trainz portal | Arquivos de jogos | Trainz Simulator Content Dispatcher Pack | N3V Games Trainz Simulator | Trainz portal |
| .CEM | Tilted Mill Entertainment | Arquivos de jogos | Children Of The Nile Model File | Tilted Mill Entertainment Children of the Nile | Tilted Mill Entertainment |
| .CETRAINER | Open Source | Arquivos de jogos | Cheat Engine Trainer File | Cheat Engine | Open Source |
| .CFR | Z8Games | Arquivos de jogos | Cross Fire Replay File | Crossfire | Z8Games |
| .CGF | Ubisoft | Arquivos de jogos | Crytek Geometry Format File | CRYENGINE | Crytek |
| .CGG | Electronic Arts | Arquivos de jogos | Renegade Paintball Audio Data | Renegade | Electronic Arts |
| .CGO | PopTop Software Inc. | Arquivos de jogos | Railroad Tycoon 3 Car Properties File | Railroad Tycoon 3 | PopTop Software Inc. |
| .CGT | Gold Parsing System Team | Arquivos de jogos | Gold Parsing System Compiled Grammar Table File | GOLD | Gold Parsing System Team |
| .CGZ | Wouter van Oortmerssen | Arquivos de jogos | Cube Map File | Cube | Wouter van Oortmerssen |
| .CHAR | Nintendo | Arquivos de jogos | Nintendo DS Character Tile Data File | Tinke | Pleonex |
| .CHD | Open Source | Arquivos de jogos | MAME Hard Disk Image | MAME | Open Source |
| .CHESSTITANSSAVE-MS | Microsoft Corporation | Arquivos de jogos | Chess Titans Saved Game | Microsoft Windows | Microsoft Corporation |
| .CHK | Sophos | Arquivos de jogos | InterCheck Checksum Database | Sophos | Sophos |
| .CHM | Microsoft Corporation | Arquivos de jogos | Compiled HTML Help File | Mozilla Firefox | Mozilla |
| .CHT | Nintendo | Arquivos de jogos | SNES Cheat File | ZSNES | Nintendo |
| .CHUZZLEDELUXESAVEDGAME | Yahoo! | Arquivos de jogos | Chuzzle Deluxe Saved Game | Chuzzle | PopCap Games |
| .CIA | Nintendo | Arquivos de jogos | CTR Importable Archive | Ctrtool | Interscape |
| .CIV | Activision | Arquivos de jogos | Empire Earth Custom Civilization Information File | Empire Earth | Sierra Entertainment |
| .CIV4SAVEDGAME | Firaxis Games | Arquivos de jogos | Civilization IV Save Game File | Civilization | Take-Two Interactive |
| .CIV4WORLDBUILDERSAVE | Firaxis Games | Arquivos de jogos | Civilization IV World Builder Save File | Civilization lV | Firaxis Games |
| .CK2 | id Software | Arquivos de jogos | Commander Keen 2 Game Data | TED5 | id Software |
| .CLB | Microsoft Corporation | Arquivos de jogos | COM+ Catalog File | Microsoft COM+ | Microsoft Corporation |
| .CLI | Rockstar Games | Arquivos de jogos | Grand Theft Auto Clip Data File | Grand Theft Auto IV | Rockstar Games |
| .CLIP | CELSYS | Arquivos de jogos | Clip Studio Format File | CELSYS Clip Studio Paint Pro | CELSYS |
| .CLOG | SpreadMaster | Arquivos de jogos | SpreadMaster Client Log File | Unknown Software | Unknown Developer |
| .CLT | Clarity Legal | Arquivos de jogos | Clarity Legal Transcript File | Clarity Legal Viewer | Clarity Legal |
| .CLU | Revolution Software | Arquivos de jogos | Broken Sword 2 Dialogue Data | Broken Sword 2 | Revolution Software |
| .CM | Rockstar Games | Arquivos de jogos | CLEO Custom Mission | Sanny Builder | Open Source |
| .CMD | Microsoft Corporation | Arquivos de jogos | Windows Command File | Microsoft Notepad | Microsoft Corporation |
| .CME | Viva Media, LLC | Arquivos de jogos | Crazy Machines Experiment File | Crazy Machines | FAKT Software |
| .CMG | Ubisoft | Arquivos de jogos | ChessMaster Saved Game | ChessMaster | Ubisoft Blue Byte |
| .CML | Unknown Developer | Arquivos de jogos | Chemical Markup Language File | Avogadro | Open Source |
| .CMP | Microsoft Corporation | Arquivos de jogos | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CNS | Elecbyte | Arquivos de jogos | M.U.G.E.N. Character States File | Elecbyte M.U.G.E.N | Elecbyte |
| .CNT | Microsoft Corporation | Arquivos de jogos | Help Contents File | Microsoft HTML Help Workshop | Microsoft Corporation |
| .COF | Microchip Technology Inc. | Arquivos de jogos | MPLAB COFF File | MPLAB IDE | Microchip Technology Inc. |
| .COK | Eidos Interactive | Arquivos de jogos | Carmageddon Patch File | Carmageddon TDR 2000 | Torus Games |
| .COL | Open Source | Arquivos de jogos | Bibexcel File | BibExcel | Open Source |
| .COMFYCAKESSAVE-MS | Microsoft Corporation | Arquivos de jogos | Comfy Cakes Saved Game File | Comfy Cakes | Microsoft Corporation |
| .COS | Phase One | Arquivos de jogos | Capture One Settings File | Capture One | Phase One |
| .CPK | CRI Middleware | Arquivos de jogos | CRI Middleware Package | CRI Packed File Maker | CRI Middleware |
| .CPN | Microsoft Corporation | Arquivos de jogos | Age Of Mythology Campaign File | Microsoft Age of Empires | Ensemble Studios |
| .CPR | Steinberg | Arquivos de jogos | Cubase Project | Steinberg Cubase | Steinberg |
| .CPS | Interscape | Arquivos de jogos | The Powder Toy Save File | The Powder Toy | Interscape |
| .CPX | Oracle Corporation | Arquivos de jogos | Oracle ADF Binding Context File | Oracle JDeveloper | Oracle Corporation |
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