| .BT3 | MomSoft | Instellingsbestanden | Control Runner Button Configuration File | Control Runner | MomSoft |
| .BVL | Corel | Instellingsbestanden | Micrografx Picture Publisher 8 Textures File | Micrografx Picture Publisher | Corel |
| .BXX | Bitmanagement Software | Instellingsbestanden | BS Contact Parameter File | Bitmanagement Software BS Contact | Bitmanagement Software |
| .CAMP | Microsoft Corporation | Instellingsbestanden | WCS Color Appearance Model Profile File | Microsoft Windows | Microsoft Corporation |
| .CASE | Bohemian Coding | Instellingsbestanden | SlipCover Case File | SlipCover | Bohemian Coding |
| .CCF | Interscape | Instellingsbestanden | CryptLoad Container File | CryptLoad | CryptLoad |
| .CCM | Clickteam | Instellingsbestanden | Multimedia Fusion Custom Menu Data | Clickteam Fusion 2.5 | Clickteam |
| .CDF | Wolfram Research | Instellingsbestanden | Computable Document Format File | Wolfram Research CDF Player | Wolfram Research |
| .CDT | Sony | Instellingsbestanden | CD-Text File | IsoBuster | Smart Projects |
| .CEX | Dassault Systèmes | Instellingsbestanden | SolidWorks Enterprise PDM Vault Export File | Dassault Systemes SolidWorks | Dassault Systèmes |
| .CF | Proofpoint, Inc. | Instellingsbestanden | Sendmail Configuration File | Apache OpenOffice | Apache Software Foundation |
| .CGR | Dassault Systèmes | Instellingsbestanden | CATIA Graphical Representation File | CATIA | Dassault Systèmes |
| .CHA | Snak Software | Instellingsbestanden | IRC Chat Configuration File | Visual IRC | Adrian Cable and Jesse McGrew |
| .CHK | Sophos | Instellingsbestanden | InterCheck Checksum Database | Sophos | Sophos |
| .CHL | Leadtek Research | Instellingsbestanden | WinFast PVR2 Channel List | Leadtek Research WinFast PVR2 | Leadtek Research |
| .CHX | Autodesk, Inc. | Instellingsbestanden | AutoCAD Standards Check File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .CIK | Corel | Instellingsbestanden | Corel Graphics 10 Custom Dual Tone File | CorelDRAW Graphics Suite | Corel |
| .CIS | VicTech Software | Instellingsbestanden | CheckInbox Settings File | VicTech Software CheckInbox | VicTech Software |
| .CKS | Microsoft Corporation | Instellingsbestanden | Microsoft Windows CE Image Info Data | Microsoft Windows CE Embedded | Microsoft Corporation |
| .CLR | Adobe Systems Incorporated | Instellingsbestanden | Animate Color Set | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .CLV | Yamaha Corporation | Instellingsbestanden | Yamaha Cool Voices Data | Yamaha SoundVQ Player | Yamaha Corporation |
| .CLY | Corel | Instellingsbestanden | CorelDRAW Custom Layout | CorelDRAW Graphics Suite | Corel |
| .CM | Rockstar Games | Instellingsbestanden | CLEO Custom Mission | Sanny Builder | Open Source |
| .CMB | Jeffrey C. Johnson | Instellingsbestanden | Xtree For Windows Button Bar | ZTreeWin | Zedtek Inc. |
| .CMP | Microsoft Corporation | Instellingsbestanden | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CNF | MySQL AB | Instellingsbestanden | MySQL Configuration File | MySQL | Oracle Corporation |
| .CNM | David Harris | Instellingsbestanden | Pegasus Mail New Message Template File | CaseMap | LexisNexis |
| .COL | Open Source | Instellingsbestanden | Bibexcel File | BibExcel | Open Source |
| .CONF | Unknown Developer | Instellingsbestanden | Generic Configuration File | Microsoft Notepad | Microsoft Corporation |
| .CONFIGURE | Open Source | Instellingsbestanden | Bash Data | Linux | Open Source |
| .CONT | Panasonic Corporation | Instellingsbestanden | Panasonic Camcorder Metadata | Panasonic HD Writer AE | Panasonic Corporation |
| .COP | Cisco Systems | Instellingsbestanden | CISCO Options Package Settings | Unknown Software | Unknown Developer |
| .COS | Phase One | Instellingsbestanden | Capture One Settings File | Capture One | Phase One |
| .CPF | IBM | Instellingsbestanden | Cognos Project File | IBM Cognos Business Intelligence | IBM |
| .CPL | Microsoft Corporation | Instellingsbestanden | Windows Control Panel Item | Microsoft Windows | Microsoft Corporation |
| .CPM | Cisco Systems | Instellingsbestanden | Cisco Secure Policy Manager Settings | Cisco Secure Policy Manager | Cisco Systems |
| .CPR | Steinberg | Instellingsbestanden | Cubase Project | Steinberg Cubase | Steinberg |
| .CPS | Interscape | Instellingsbestanden | The Powder Toy Save File | The Powder Toy | Interscape |
| .CPX | Oracle Corporation | Instellingsbestanden | Oracle ADF Binding Context File | Oracle JDeveloper | Oracle Corporation |
| .CRW | Canon Inc. | Instellingsbestanden | Canon Raw CIFF Image File | MacPhun ColorStrokes | Macphun |
| .CSA | Agilent Technologies | Instellingsbestanden | PNA Code Calset File | PNA Code | Agilent Technologies |
| .CSF | Intergraph Corporation | Instellingsbestanden | GeoMedia Coordinate System File | Intergraph GeoMedia | Hexagon Geospatial |
| .CSK | Apple | Instellingsbestanden | ClarisWorks Data | Apple AppleWorks | Apple |
| .CST | Smith Micro Software | Instellingsbestanden | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .CSW | Corel | Instellingsbestanden | Corel WordPerfect Setup Information Data | Corel WordPerfect | Corel |
| .CTB | Autodesk, Inc. | Instellingsbestanden | AutoCAD Color-Based Plot Style File | Autodesk AutoCAD | Autodesk, Inc. |
| .CUS | Autodesk, Inc. | Instellingsbestanden | AutoCAD Custom Dictionary File | Microsoft Notepad | Microsoft Corporation |
| .CVA | Hewlett-Packard | Instellingsbestanden | HP SSM Information File | HP System Software Manager (SSM) | Hewlett-Packard |
| .CWF | Corel Corporation | Instellingsbestanden | CorelDRAW Workspace File | CorelDRAW Graphics Suite | Corel |
| .CYBERDUCKLICENSE | Open Source | Instellingsbestanden | Cyberduck Donation Key | Cyberduck | Open Source |
| .CYBERDUCKPROFILE | Open Source | Instellingsbestanden | Cyberduck Connection Profile | Cyberduck | Open Source |
| .CYM | Open Source | Instellingsbestanden | AdPlug Callus OPL Register Logs | AdPlug | Open Source |
| .DAR | Open Source | Instellingsbestanden | DAR Disk Archive File | DAR (Disk Archive) | Open Source |
| .DB | Dwayne Richard Hipp | Instellingsbestanden | Mobile Device Database File | SQLite | Dwayne Richard Hipp |
| .DBB | GSC Game World | Instellingsbestanden | S.T.A.L.K.E.R. Game File | S.T.A.L.K.E.R | GSC Game World |
| .DBG | Microsoft Corporation | Instellingsbestanden | Visual FoxPro Debugger Configuration File | Microsoft Visual FoxPro | Microsoft Corporation |
| .DBH | Freescale | Instellingsbestanden | CodeWarrior Debug Preferences | CodeWarrior | NXP |
| .DCC | Nokia | Instellingsbestanden | Nokia Dynamic Camera Configuration | Symbian OS | Nokia |
| .DCF | Sony Mobile Communications | Instellingsbestanden | DRM Content Format File | DRM Packager | Sony Mobile Communications |
| .DCL | Autodesk, Inc. | Instellingsbestanden | AutoCAD Dialog Definition File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DCN | Autodesk, Inc. | Instellingsbestanden | Autodesk Depth Slope Definition | Autodesk AutoCAD Civil 3D | Autodesk, Inc. |
| .DCP | Embarcadero Technologies | Instellingsbestanden | Delphi Compiled Package | Delphi (IDE) | Embarcadero Technologies |
| .DDF | Microsoft Corporation | Instellingsbestanden | Diamond Directive File | Microsoft Notepad | Microsoft Corporation |
| .DDR | Microcosm Ltd. | Instellingsbestanden | DDRemote Parameter Data | Dinkey Pro/FD | Microcosm Ltd. |
| .DFM | Open Source | Instellingsbestanden | Pascal File | Notepad++ | Don Ho |
| .DFN | Embarcadero Technologies | Instellingsbestanden | Delphi Definition Data | RAD Studio | Embarcadero Technologies |
| .DFR | SmartWare Corporation | Instellingsbestanden | SmartWare Report Definition File | SmartWare | SmartWare Corporation |
| .DFS | Open Source | Instellingsbestanden | BrainSuite Surface File | BrainSuite | Open Source |
| .DFT | Breaktru Software | Instellingsbestanden | eJuice Me Up Default Settings File | eJuice Me Up | Breaktru Software |
| .DICPROOF | Microsoft Corporation | Instellingsbestanden | Microsoft Dictionary Proofing File | Microsoft Excel | Microsoft Corporation |
| .DIRECTORY | KDE | Instellingsbestanden | KDE Folder View Properties File | KDE (K Desktop Environment) | KDE |
| .DKS | Symantec Corporation | Instellingsbestanden | DataKeeper Configuration File | DataKeeper | Symantec Corporation |
| .DML | Sybase, Inc | Instellingsbestanden | DynaScript File | Internet Explorer | Microsoft Corporation |
| .DMV | Adobe Systems Incorporated | Instellingsbestanden | Adobe Acrobat Catalog Data | Adobe Acrobat DC | Adobe Systems Incorporated |
| .DNP | Apple | Instellingsbestanden | DRM Digital Rights Management Data | Apple QuickTime Player | Apple |
| .DOK | Nenad Hrg | Instellingsbestanden | DesktopOK Icons Layout File | DesktopOK | Nenad Hrg |
| .DOP | DxO Labs | Instellingsbestanden | DxO Optics Pro Correction Settings File | DxO OpticsPro | DxO Labs |
| .DOWNLOADHOST | Microsoft Corporation | Instellingsbestanden | MSN Explorer Download View | MSN Explorer | Microsoft Corporation |
| .DPI | Adlib Tracker II | Instellingsbestanden | Adlib Express Document Processing Information Settings | Adlib Express | Adlib Tracker II |
| .DPS | DivX, LLC. | Instellingsbestanden | DivX Player 2 Skin File | DivX | DivX, LLC. |
| .DPV | Siemens PLM Software | Instellingsbestanden | Siemens NX Drafting Standard Filed | Siemens PLM NX | Siemens PLM Software |
| .DSC | Kingsoft | Instellingsbestanden | Kingsoft Design Science Equation File | Kingsoft Office | Kingsoft |
| .DSD | Autodesk, Inc. | Instellingsbestanden | AutoCAD Drawing Set Description File | Autodesk AutoCAD | Autodesk, Inc. |
| .DSF | DAZ 3D | Instellingsbestanden | DAZ Studio Asset File | DAZ Studio | DAZ 3D |
| .DSH | SnoopSoft | Instellingsbestanden | Dashboard PDA Wallpaper File | DashBoard | SnoopSoft |
| .DSL | ABBYY | Instellingsbestanden | Lingvo Dictionary Data File | ABBYY Lingvo Dictionary | ABBYY |
| .DST | Autodesk, Inc. | Instellingsbestanden | AutoCAD Sheet Set File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .DSW | Microsoft Corporation | Instellingsbestanden | Microsoft Visual Studio Workspace | Microsoft Visual Studio | Microsoft Corporation |
| .DSX | DAZ 3D | Instellingsbestanden | DAZ Studio XML File | DAZ Studio | DAZ 3D |
| .DS_STORE | Apple | Instellingsbestanden | Mac OS X Folder Settings File | Mac OS X Finder | Apple |
| .DTB | DataCAD LLC | Instellingsbestanden | DataCAD Custom Toolbar File | DataCAD | DataCAD LLC |
| .DTD | Syncro Soft | Instellingsbestanden | Document Type Definition File | Microsoft Notepad | Microsoft Corporation |
| .DUCK | Open Source | Instellingsbestanden | Cyberduck Bookmark | Cyberduck | Open Source |
| .DUN | Trendy Entertainment | Instellingsbestanden | Dungeon Defenders Saved Game File | Trendy Entertainment Dungeon Defenders | Trendy Entertainment |
| .DUP | Microsoft Corporation | Instellingsbestanden | Microsoft Windows DUA Polling Reconfiguration Data | Microsoft Windows | Microsoft Corporation |
| .DUPX | Logix Business Integration | Instellingsbestanden | DuupeCheck Project File | DuupeCheck | Logix Business Integration |
| .DVP | Autodesk, Inc. | Instellingsbestanden | AutoCAD Device Parameter File Format | Autodesk AutoCAD | Autodesk, Inc. |
| .DZS | SpeedBit | Instellingsbestanden | Download Accelerator Skin | Download Accelerator Plus | SpeedBit |
| .EAP | Sparx Systems | Instellingsbestanden | Enterprise Architect Project | Enterprise Architect | Sparx Systems |
| .ECELP4800 | Nuera Communications | Instellingsbestanden | Nuera ECELP Speech Codec Family | Unknown Software | Unknown Developer |
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