| .BRF | Duxbury Systems | Arquivos de dados | Braille Ready Format File | Duxbury Braille Translator | Duxbury Systems |
| .BRL | Duxbury Systems | Arquivos de dados | MicroBraille File | Duxbury Braille Translator | Duxbury Systems |
| .BRN | BrainStorm Software | Arquivos de dados | BrainStorm Data File | BrainStorm | BrainStorm Software |
| .BRP | Onyx Computing | Arquivos de dados | Tree Professional Broadleaf Creator Image | OnyxTREE BROADLEAF | Onyx Computing |
| .BRS | Adobe Systems Incorporated | Arquivos de dados | RoboHelp Browse Sequence File | Adobe RoboHelp | Adobe Systems Incorporated |
| .BRT | DAZ 3D | Arquivos de dados | Bryce Textures File | DAZ 3D Bryce | DAZ 3D |
| .BRU | Open Source | Arquivos de dados | Brutus Restore Data | Brutus | Open Source |
| .BRW | Calyx Technology | Arquivos de dados | Calyx Point File | Calyx Point | Calyx Technology |
| .BSB | Take-Two Interactive | Arquivos de dados | BioShock Saved Game File | BioShock | Take-Two Interactive |
| .BSC | Microsoft Corporation | Arquivos de dados | Visual Studio Source Browser Information File | Microsoft Visual Studio | Microsoft Corporation |
| .BSD | IEEE Xplore | Arquivos de dados | Boundary Scan Description Language Data File | Microsoft Notepad | Microsoft Corporation |
| .BSE | Open Source | Arquivos de dados | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .BSU | Brindys Software | Arquivos de dados | Brindys BriTray File | BriTray | Brindys Software |
| .BSV | Bluespec, Inc. | Arquivos de dados | Bluespec System Verilog Data File | Bluespec Development Workstation | Bluespec, Inc. |
| .BSX | Parallax | Arquivos de dados | PBASIC Preprocessor Output | BASIC Stamp Windows Editor | Parallax |
| .BSY | Paul Rädle | Arquivos de dados | VTrain Learning Cardfile | Vocabulary Trainer (VTrain) | Paul Rädle |
| .BTF | Bank of America | Arquivos de dados | NationsBank Check Images | Microsoft Edge | Microsoft Corporation |
| .BTIF | Bank of America | Arquivos de dados | NationsBank Check Images | Microsoft Edge | Microsoft Corporation |
| .BTM | Microsoft Corporation | Arquivos de dados | BizTalk Map File | BizTalk Server | Microsoft Corporation |
| .BTR | Pervasive Software | Arquivos de dados | Btrieve Database File | Pervasive Btrieve Database Manager | Actian Corporation |
| .BUFFER | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BUL | Physiome Project | Arquivos de dados | JSim Bullseye Data Format | JSim | Physiome Project |
| .BURST | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .BUSH | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .BVN | Hans Hundegger | Arquivos de dados | Hundegger CNC Machining Format | CAMBIUM | Hans Hundegger |
| .BWD | BanglaSoftware Group | Arquivos de dados | BanglaWord Document File | BanglaWord | BanglaSoftware Group |
| .BWM | Statistics Netherlands | Arquivos de dados | Blaise Data File | Blaise | Statistics Netherlands |
| .BXI | Statistics Netherlands | Arquivos de dados | Blaise Data File | Blaise | Statistics Netherlands |
| .BXT | Traxon Technologies | Arquivos de dados | ETH2DALI Firmware | ETH2DALI | Traxon Technologies |
| .BXU | Sony | Arquivos de dados | PictureGear Studio File | PictureGear Studio | Sony |
| .BXX | Bitmanagement Software | Arquivos de dados | BS Contact Parameter File | Bitmanagement Software BS Contact | Bitmanagement Software |
| .BY | Cadence Design Systems | Arquivos de dados | PSpice Data | Pspice | Cadence Design Systems |
| .BYTES | Unity Technologies | Arquivos de dados | Unity Binary Text Asset Data | Unity Technologies Unity | Unity Technologies |
| .C0 | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .C0R | Odeon / Odeon Worldwide | Arquivos de dados | JAF Nokia BB5 Firmware Flash | JAF | Odeon / Odeon Worldwide |
| .C10 | e-merge GmbH | Arquivos de dados | WinAce Split Archive File | WinAce | e-merge GmbH |
| .C11 | SINTEF | Arquivos de dados | CARE-S InfoWorks User-Defined Pollutant Detail Data | CARE-S | SINTEF |
| .C11AMC | ClueTrust | Arquivos de dados | Cartographica/CartoMobile File | Cartographica | ClueTrust |
| .C11AMZ | ClueTrust | Arquivos de dados | Cartographica/CartoMobile File | Cartographica | ClueTrust |
| .C1DX | GrapeCity | Arquivos de dados | C1Report C1D Open XML Document | C1Report | GrapeCity |
| .C1P | Phase One | Arquivos de dados | Capture One Preview Data | Capture One | Phase One |
| .C1W | Phase One | Arquivos de dados | Capture One Work Data | Capture One | Phase One |
| .C3 | The POV-Team | Arquivos de dados | Pov-Ray For Windows 3.1 Scenes Advanced Newltpot | Pov-Ray | The POV-Team |
| .C3D | Motion Lab Systems | Arquivos de dados | Coordinate 3D File | C3Deditor | Motion Lab Systems |
| .C9 | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CA | AT&T Labs | Arquivos de dados | Initial Telnet Cache | Unix | AT&T Labs |
| .CA1 | Piotr Fusik | Arquivos de dados | CrackArt Picture Image | Recoil | Piotr Fusik |
| .CAC | dBase, LLC | Arquivos de dados | dBASE IV Executable Data | dBase | dBase, LLC |
| .CAF | Apple | Arquivos de dados | Apple Core Audio File | Apple QuickTime Player | Apple |
| .CAH | Ulead Systems | Arquivos de dados | Ulead Photo Explorer Thumbnail Cache | Ulead Photo Express | Ulead Systems |
| .CALC | Apple | Arquivos de dados | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .CALCULATOR | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .CAP | Microsoft Corporation | Arquivos de dados | Network Monitor Packet Capture Data File | Microsoft Network Monitor | Microsoft Corporation |
| .CAR | Unknown Developer | Arquivos de dados | Car Explorer Data File | Car Explorer | Unknown Developer |
| .CAS | Autodesk, Inc. | Arquivos de dados | Autodesk Cascade License File | AutoCAD Architecture | Autodesk, Inc. |
| .CASTLE | Unknown Developer | Arquivos de dados | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .CAT | Microsoft Corporation | Arquivos de dados | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CAV | Comodo Group | Arquivos de dados | Comodo Virus Definitions File | Comodo Group Internet Security | Comodo Group |
| .CB4 | Actuate Corporation | Arquivos de dados | Actuate Analytics File | Actuate Analytics | Actuate Corporation |
| .CBC | Open Source | Arquivos de dados | Sony Portable Reader Comic E-book File | Calibre | Open Source |
| .CBI | IBM | Arquivos de dados | IBM System/360 Column Binary Formatted File | Unknown Software | Unknown Developer |
| .CBM | EaseUS | Arquivos de dados | EaseUS Todo Backup File | EaseUS Todo Backup | EaseUS |
| .CBO | Microsoft Corporation | Arquivos de dados | Microsoft Interactive Training File | Microsoft Windows | Microsoft Corporation |
| .CBZ | Open Source | Arquivos de dados | Comic Book Zip Archive File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CC1 | Briggs Softworks | Arquivos de dados | Briggs Softworks Calendar Commander Data File | Calendar Commander | Briggs Softworks |
| .CC2 | Briggs Softworks | Arquivos de dados | Calendar Commander Calendar Data | Calendar Commander | Briggs Softworks |
| .CC3 | Marcus Humann | Arquivos de dados | CUEcards Data File | CUEcards 2000 | Marcus Humann |
| .CCA | IBM | Arquivos de dados | Cc:Mail Archive File | Microsoft Importer for Lotus ccMail Archives | Microsoft Corporation |
| .CCF | Interscape | Arquivos de dados | CryptLoad Container File | CryptLoad | CryptLoad |
| .CCH | Microsoft Corporation | Arquivos de dados | .NET Security Resolution Cache File | Microsoft .NET Framework | Microsoft Corporation |
| .CCJ | WordWeb Software | Arquivos de dados | Crossword Compiler Compiled Crossword Applet File | Crossword Compiler | WordWeb Software |
| .CCK | U.S. Department of Energy | Arquivos de dados | COMcheck Data File | COMcheck | U.S. Department of Energy |
| .CCP | Ambiera | Arquivos de dados | CopperCube JavaScript File | CopperCube | Ambiera |
| .CCR | Records For Living | Arquivos de dados | ASTM Continuity Of Care Record | Records For Living HealthFrame Viewer | Records For Living |
| .CCT | Adobe Systems Incorporated | Arquivos de dados | Director Protected Cast Resource | Adobe Director | Adobe Systems Incorporated |
| .CCV | Master Control Inc. | Arquivos de dados | Crytal Vision Report | CTMS | Master Control Inc. |
| .CD | Microsoft Corporation | Arquivos de dados | Visual Studio Class Diagram | Microsoft Visual Studio | Microsoft Corporation |
| .CD1 | DATAIR | Arquivos de dados | DATAIR Cafeteria Document System Data | DATAIR Cafeteria Plan Document System | DATAIR |
| .CDB | Nokia | Arquivos de dados | Symbian Phonebook Database | Nokia PC Suite | Nokia |
| .CDBCMSG | CONTACT Software | Arquivos de dados | CIM Database CMSG Data File | CIM Database | CONTACT Software |
| .CDE | Kubotek Corporation | Arquivos de dados | CADKEY Dynamic Extension | CADKEY | Kubotek Corporation |
| .CDF | Wolfram Research | Arquivos de dados | Computable Document Format File | Wolfram Research CDF Player | Wolfram Research |
| .CDI | Intex Solutions, Inc. | Arquivos de dados | INTEX DealMaker Output | DealMaker | Intex Solutions, Inc. |
| .CDIC | Unknown Developer | Arquivos de dados | ConlangDictionary File | ConlangDictionary | Unknown Developer |
| .CDP | Trainz portal | Arquivos de dados | Trainz Simulator Content Dispatcher Pack | N3V Games Trainz Simulator | Trainz portal |
| .CDPX | CS Odessa | Arquivos de dados | ConceptDraw PROJECT XML File | CS Odessa ConceptDraw PROJECT | CS Odessa |
| .CDPZ | CS Odessa | Arquivos de dados | ConceptDraw PROJECT Document | CS Odessa ConceptDraw PROJECT | CS Odessa |
| .CDR | Corel | Arquivos de dados | CorelDRAW Vector Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .CDS | CS Odessa | Arquivos de dados | ConceptDraw SlideShow | ConceptDraw PRO | CS Odessa |
| .CDV | Square Box Systems | Arquivos de dados | CatDV Catalog | CatDV | Square Box Systems |
| .CDW | ASCON | Arquivos de dados | KOMPAS Document | ASCON KOMPAS-3D | ASCON |
| .CDX | Microsoft Corporation | Arquivos de dados | Compound Index File | Microsoft Visual FoxPro | Microsoft Corporation |
| .CDXML | PerkinElmer | Arquivos de dados | ChemDraw XML File | Open Babel | Open Babel development team |
| .CDY | Prof. Dr. Ulrich Kortenkamp | Arquivos de dados | Cinderella Construction File | Cinderella | Prof. Dr. Ulrich Kortenkamp |
| .CED | JVCKenwood Group | Arquivos de dados | JVC Camera Video Data File | Unknown Software | Unknown Developer |
| .CEF | Richard Stott | Arquivos de dados | Class Action Gradebook Elementary File | Class Action Gradebook "Elementary Edition" | Richard Stott |
| .CEL | Affymetrix | Arquivos de dados | Affymetrix Probe Results File | The MathWorks MATLAB | MathWorks |
| .CEN | European Committee for Standardization | Arquivos de dados | CEN EN 13032 Photometric Data | Unknown Software | Unknown Developer |
| .CERT | AOL | Arquivos de dados | Netscape Certificate Index | Netscape Navigator | NetScape |
| .CF | Proofpoint, Inc. | Arquivos de dados | Sendmail Configuration File | Apache OpenOffice | Apache Software Foundation |
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