.BTR | Pervasive Software | Database Files | Btrieve Database File | Microsoft FrontPage | Microsoft Corporation |
.BUT | ACD Systems | Uncommon Files | Canvas Web Button (CD Audio Track) | ACD Systems Canvas | Microsoft Corporation |
.CAB | Microsoft Corporation | System Files | Windows Cabinet File | Windows Installer | Microsoft Corporation |
.CAG | Microsoft Corporation | Vector Image Files | ClipArt Gallery Package | Microsoft PowerPoint | Microsoft Corporation |
.CAL | Newera Software Technology, Inc. | Raster Image Files | CALS Raster File | Microsoft Outlook | Microsoft Corporation |
.CAMP | Microsoft Corporation | Settings Files | WCS Color Appearance Model Profile File | Microsoft Windows | Microsoft Corporation |
.CAP | Microsoft Corporation | Data Files | Network Monitor Packet Capture Data File | Microsoft Network Monitor | Microsoft Corporation |
.CAT | Microsoft Corporation | System Files | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
.CA_ | Microsoft Corporation | Compressed Files | Microsoft Cabinet File | Microsoft Windows | Microsoft Corporation |
.CB | Microsoft Corporation | System Files | Microsoft Clean Boot File | Microsoft Windows | Microsoft Corporation |
.CBO | Microsoft Corporation | Data Files | Microsoft Interactive Training File | Microsoft Windows | Microsoft Corporation |
.CBT | Various Developers | Compressed Files | Comic Book TAR File | Microsoft Support | Microsoft Corporation |
.CC | Don Ho | Developer Files | C/C++ Source Code File | Microsoft Visual Studio | Microsoft Corporation |
.CC2 | Briggs Softworks | Data Files | Calendar Commander Calendar Data | Microsoft Notepad | Microsoft Corporation |
.CCA | IBM | Data Files | Cc:Mail Archive File | Microsoft Importer for Lotus ccMail Archives | Microsoft Corporation |
.CCH | Microsoft Corporation | Uncommon Files | .NET Security Resolution Cache File | Microsoft .NET Framework | Microsoft Corporation |
.CD | Microsoft Corporation | Developer Files | Visual Studio Class Diagram | Microsoft Visual Studio | Microsoft Corporation |
.CDA | Microsoft Corporation | Audio Files | CD Audio Track Shortcut | Microsoft Windows Media Player | Microsoft Corporation |
.CDAT | Microsoft Corporation | Uncommon Files | Internet Security And Acceleration (ISA) Server Cache File | Microsoft Internet Security and Acceleration (ISA) | Microsoft Corporation |
.CDB | Nokia | Database Files | Symbian Phonebook Database | Microsoft ActiveSync | Microsoft Corporation |
.CDDA | Microsoft Corporation | Audio Files | CD Digital Audio File | Logic Express | Microsoft Corporation |
.CDF | Wolfram Research | Page Layout Files | Computable Document Format File | Internet Explorer | Microsoft Corporation |
.CDF-MS | Microsoft Corporation | Uncommon Files | ClickOnce Compiled Manifest File | Microsoft ClickOnce | Microsoft Corporation |
.CDMP | Microsoft Corporation | System Files | WCS Device Model Profile | Microsoft Windows | Microsoft Corporation |
.CDR | Corel | Vector Image Files | CorelDRAW Vector Image File | Microsoft Windows Media Player | Microsoft Corporation |
.CDX | Microsoft Corporation | Data Files | Compound Index File | Microsoft Visual FoxPro | Microsoft Corporation |
.CDXML | PerkinElmer | Data Files | ChemDraw XML File | Microsoft Windows PowerShell | Microsoft Corporation |
.CEL | Affymetrix | Data Files | Affymetrix Probe Results File | Microsoft Notepad | Microsoft Corporation |
.CELX | Open Source | Executable Files | Celestia Script File | Microsoft Notepad | Microsoft Corporation |
.CER | Microsoft Corporation | Web Files | Internet Security Certificate | Internet Explorer | Microsoft Corporation |
.CF | Proofpoint, Inc. | Settings Files | Sendmail Configuration File | Microsoft Notepad | Microsoft Corporation |
.CFB | Microsoft Corporation | Data Files | Compound Binary File | Microsoft Visual Studio | Microsoft Corporation |
.CFG | Unknown Developer | Developer Files | Configuration File | Microsoft Notepad | Microsoft Corporation |
.CFK | Microsoft Corporation | Uncommon Files | Microsoft Developer Studio Diagram File | Microsoft Visual Studio | Microsoft Corporation |
.CFL | Corel Corporation | Uncommon Files | Corel Flow Flow Chart File | Microsoft Visual Studio | Microsoft Corporation |
.CGI | Unknown Developer | Executable Files | Common Gateway Interface Script | Microsoft Notepad | Microsoft Corporation |
.CH3 | Harvard Graphics | Page Layout Files | Harvard Graphics DOS Chart File | ACD Systems Canvas | Microsoft Corporation |
.CHART | Interscape | Text Files | Feedback Chart File | Microsoft Notepad | Microsoft Corporation |
.CHESSTITANSSAVE-MS | Microsoft Corporation | Game Files | Chess Titans Saved Game | Microsoft Windows | Microsoft Corporation |
.CHG | Quicken | Data Files | Quicken Online Data File | Microsoft Windows | Microsoft Corporation |
.CHI | Microsoft Corporation | Data Files | Microsoft Help File Index | Microsoft Visual FoxPro | Microsoft Corporation |
.CHK | Sophos | Data Files | InterCheck Checksum Database | Internet Explorer | Microsoft Corporation |
.CHL | Leadtek Research | Settings Files | WinFast PVR2 Channel List | Internet Explorer | Microsoft Corporation |
.CHM | Microsoft Corporation | Web Files | Compiled HTML Help File | Microsoft HTML Help Workshop | Microsoft Corporation |
.CHORD | Open Source | Text Files | Song Chords File | Microsoft Word | Microsoft Corporation |
.CHS | Microsoft Corporation | System Files | Windows Chinese Noise-Word List File | Microsoft Windows | Microsoft Corporation |
.CHT | Nintendo | Game Files | SNES Cheat File | Microsoft Notepad | Microsoft Corporation |
.CI | Microsoft Corporation | System Files | Windows Content Indexer Catalog File | Microsoft Windows | Microsoft Corporation |
.CIK | Corel | Settings Files | Corel Graphics 10 Custom Dual Tone File | Microsoft Notepad | Microsoft Corporation |
.CIL | Symantec Corporation | Data Files | Norton CleanSweep Installation Log File | Microsoft Notepad | Microsoft Corporation |
.CKP | Microsoft Corporation | Database Files | SQL Server Checkpoint File | Microsoft SQL Server | Microsoft Corporation |
.CKS | Microsoft Corporation | Settings Files | Microsoft Windows CE Image Info Data | Microsoft Windows CE Embedded | Microsoft Corporation |
.CLB | Microsoft Corporation | System Files | COM+ Catalog File | Microsoft COM+ | Microsoft Corporation |
.CLC | Microsoft Corporation | Data Files | Microsoft Schedule+ 7 Habits Mission Statement Data | Microsoft Schedule Plus | Microsoft Corporation |
.CLG | Microsoft Corporation | System Files | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
.CLN | Microsoft Corporation | Backup Files | Microsoft Windows 3.x Configuration Backup File | Microsoft Windows 3.x | Microsoft Corporation |
.CLW | Microsoft Corporation | Developer Files | Visual C++ ClassWizard File | Microsoft Visual C++ | Microsoft Corporation |
.CLX | IBM | Data Files | Rational XDE | Microsoft Outlook | Microsoft Corporation |
.CM0013 | Samsung Electronics | System Files | Samsung Smart TV Index File | Microsoft Word | Microsoft Corporation |
.CMD | Microsoft Corporation | Executable Files | Windows Command File | Microsoft Notepad | Microsoft Corporation |
.CMN | Microsoft Corporation | Data Files | Systems Management Server (SMS) Update | Microsoft Systems Management Server | Microsoft Corporation |
.CMO | ASUS | System Files | ASUS BIOS File | Microsoft Windows | Microsoft Corporation |
.CMP | Microsoft Corporation | Settings Files | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
.CMS | Opera Software | Web Files | Content Management System Web Page File | Internet Explorer | Microsoft Corporation |
.CMX | Corel | Vector Image Files | Corel Metafile Exchange Image File | ACD Systems Canvas | Microsoft Corporation |
.CNF | MySQL AB | Settings Files | MySQL Configuration File | Windows Telnet | Microsoft Corporation |
.CNT | Microsoft Corporation | System Files | Help Contents File | Microsoft HTML Help Workshop | Microsoft Corporation |
.CNV | ACD Systems | Vector Image Files | Canvas Drawing File | ACD Systems Canvas | Microsoft Corporation |
.CN_ | Microsoft Corporation | Compressed Files | Compressed Windows Help Content | Microsoft Windows | Microsoft Corporation |
.COD | Unknown Developer | Developer Files | Compiled Source Code | Microsoft Visual Studio | Microsoft Corporation |
.COL | Open Source | Data Files | Bibexcel File | Microsoft Multiplan | Microsoft Corporation |
.COM | Microsoft Corporation | Executable Files | DOS Command File | Microsoft Windows | Microsoft Corporation |
.COMFYCAKESSAVE-MS | Microsoft Corporation | Game Files | Comfy Cakes Saved Game File | Comfy Cakes | Microsoft Corporation |
.COMPOSITEFONT | Microsoft Corporation | Font Files | Windows Composite Font File | Microsoft XML Notepad | Microsoft Corporation |
.CONF | Unknown Developer | Settings Files | Generic Configuration File | Microsoft Notepad | Microsoft Corporation |
.CONFIG | Unknown Developer | Developer Files | Configuration File | Microsoft Notepad | Microsoft Corporation |
.CONTACT | Microsoft Corporation | Data Files | Windows Contact File | Microsoft Windows | Microsoft Corporation |
.COO | Autodesk, Inc. | Text Files | AutoCAD Bounding Coordinates Cookie | Microsoft Notepad | Microsoft Corporation |
.COV | Microsoft Corporation | Page Layout Files | Fax Cover Page File | Microsoft Fax Cover Page Editor | Microsoft Corporation |
.COVERAGE | Microsoft Corporation | Data Files | Visual Studio Code Coverage Report | Microsoft Visual Studio | Microsoft Corporation |
.COVERAGEXML | Microsoft Corporation | Data Files | Microsoft Visual Studio Code Coverage File | Microsoft Visual Studio | Microsoft Corporation |
.CPC | Cartesian Products, Inc. | Raster Image Files | CPC Compressed Image File | Internet Explorer | Microsoft Corporation |
.CPE | Microsoft Corporation | Page Layout Files | Fax Cover Page File | Microsoft Fax Cover Page Editor | Microsoft Corporation |
.CPF | IBM | Data Files | Cognos Project File | Microsoft Makecab | Microsoft Corporation |
.CPI | Sony | Video Files | AVCHD Video Clip Information | MS-DOS | Microsoft Corporation |
.CPK | CRI Middleware | Game Files | CRI Middleware Package | Microsoft Winqual Submission Tool | Microsoft Corporation |
.CPL | Microsoft Corporation | System Files | Windows Control Panel Item | Microsoft Windows | Microsoft Corporation |
.CPN | Microsoft Corporation | Game Files | Age Of Mythology Campaign File | Age of Empires II | Microsoft Corporation |
.CPP | Open Source | Developer Files | C++ Source Code File | Microsoft Visual Studio | Microsoft Corporation |
.CPQ | Compaq | System Files | Compaq OEM Disc Configuration File | Microsoft Notepad | Microsoft Corporation |
.CPR | Steinberg | Audio Files | Cubase Project | Microsoft Notepad | Microsoft Corporation |
.CPT | Corel | Raster Image Files | Corel Photo-Paint Image | Microsoft ActiveSync | Microsoft Corporation |
.CR2 | Canon Inc. | Camera Raw Files | Canon Digital Camera Raw Image File | Microsoft Windows Photos | Microsoft Corporation |
.CRD | Open Source | Uncommon Files | Guitar Tabs | Microsoft Word | Microsoft Corporation |
.CRDS | Microsoft Corporation | Backup Files | Windows CardSpace Backup File | Microsoft Windows 7 | Microsoft Corporation |
.CRL | Various Developers | Web Files | Certificate Revocation List File | Microsoft IIS | Microsoft Corporation |
.CRT | Mozilla | Web Files | Security Certificate | Internet Explorer | Microsoft Corporation |
.CRTX | Microsoft Corporation | Data Files | Office 2007 Chart Template File | Microsoft Excel | Microsoft Corporation |
.CRW | Canon Inc. | Camera Raw Files | Canon Raw CIFF Image File | Microsoft Windows Photos | Microsoft Corporation |
.CS | Microsoft Corporation | Developer Files | C# Source Code File | Visual Studio Code | Microsoft Corporation |