| .000 | Microsoft Corporation | Systeembestanden | Indexing Service Data File | Microsoft Windows | Microsoft Corporation |
| .120 | bhv | Systeembestanden | Winfunktion Mathematik V8.0 Julia Fractal File | WinFunction Mathematics | bhv |
| .170 | Phoenix Technologies | Systeembestanden | Award BIOS Upgrade File | Award Software | Phoenix Technologies |
| .190 | bhv | Systeembestanden | Winfunktion Mathematik V8.0 Julia Fractal File | WinFunction Mathematics | bhv |
| .1C0 | Phoenix Technologies | Systeembestanden | Award BIOS Upgrade File | Award Software | Phoenix Technologies |
| .286 | Microsoft Corporation | Systeembestanden | Microsoft Windows Virtual Device Driver | Microsoft Windows 3.x | Microsoft Corporation |
| .2GR | Microsoft Corporation | Systeembestanden | Windows VGA Graphic Drivers | Microsoft Windows | Microsoft Corporation |
| .32S | Microsoft Corporation | Systeembestanden | Win32s Data | Microsoft Windows 3.x | Microsoft Corporation |
| .386 | Microsoft Corporation | Systeembestanden | Windows Virtual Device Driver | Microsoft Windows | Microsoft Corporation |
| .3~6 | Microsoft Corporation | Systeembestanden | Windows 3.xx System File | Microsoft Windows | Microsoft Corporation |
| .73U | Texas Instruments, Inc. | Systeembestanden | TI-73 Explorer Operating System File | TI Connect | Texas Instruments, Inc. |
| .8XU | Texas Instruments, Inc. | Systeembestanden | TI-83 And TI-84 Plus Operating System File | TI Connect | Texas Instruments, Inc. |
| .A83 | Unknown Developer | Systeembestanden | EightyOne Sinclair ZX81 ROM File | EightyOne | SourceForge |
| .ACCT | IBM | Systeembestanden | IBM AIX System Data | IBM AIX | IBM |
| .ADM | Microsoft Corporation | Systeembestanden | Administrative Template File | Microsoft Group Policy Object Editor | Microsoft Corporation |
| .ADML | Microsoft Corporation | Systeembestanden | Group Policy Language-Specific Administrative Template | Microsoft Group Policy Object Editor | Microsoft Corporation |
| .ADMX | Microsoft Corporation | Systeembestanden | Group Policy Administrative Template File | Microsoft Group Policy Management Console | Microsoft Corporation |
| .ADV | Unknown Developer | Systeembestanden | Audio Driver File | Dune | Cryo Interactive Entertainment |
| .AML | Intel Corporation | Systeembestanden | ACPI Machine Language File | DSDTSE | otRock |
| .ANI | Microsoft Corporation | Systeembestanden | Windows Animated Cursor | ACD Systems ACDSee | ACD Systems |
| .ANN | ABBYY | Systeembestanden | Lingvo Dictionary Annotation File | ABBYY Lingvo Dictionary | ABBYY |
| .AQM | Psyberia | Systeembestanden | AlpineQuest Map File | Mobile Atlas Creator | Open Source |
| .ASEC | Google | Systeembestanden | Android Secure Application File | Google Android SDK | Google |
| .AUG | Red Hat | Systeembestanden | Red Hat Linux Shellvars File | Linux | Open Source |
| .AWA | ActiveWord Systems, Inc. | Systeembestanden | ActiveWords File | ActiveWords | ActiveWord Systems, Inc. |
| .AWS | Autodesk, Inc. | Systeembestanden | AutoCAD Work Space File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .BCD | Microsoft Corporation | Systeembestanden | Windows Boot Configuration Data File | Microsoft Registry Editor | Microsoft Corporation |
| .BCS | The Wavelength | Systeembestanden | Batch Compiler Specification File | Batch Compiler | The Wavelength |
| .BEM | Open Source | Systeembestanden | Babel Enterprise Module | Babel Enterprise | Open Source |
| .BIO | IBM | Systeembestanden | BIOS File | Intel Integrator Toolkit | Intel Corporation |
| .BK1 | Autodesk, Inc. | Systeembestanden | Autodesk Backup File | Autodesk AutoCAD Ecscad | Autodesk, Inc. |
| .BK2 | Microsoft Corporation | Systeembestanden | Windows Indexing Service File | Microsoft Windows | Microsoft Corporation |
| .BLF | Microsoft Corporation | Systeembestanden | CLFS Base Log File | Microsoft Common Log File System (CLFS) | Microsoft Corporation |
| .BMK | return7, LLC | Systeembestanden | BillMinder Backup File | return7 BillMinder | return7, LLC |
| .BOM | Apple | Systeembestanden | Mac OS X Bill Of Materials File | Echo One File Juicer | Echo One |
| .BPD | Palo Alto Software | Systeembestanden | Business Plan Pro File | Business Plan Pro | Palo Alto Software |
| .BSD | IEEE Xplore | Systeembestanden | Boundary Scan Description Language Data File | Microsoft Notepad | Microsoft Corporation |
| .BZI | GEEP EDS LLC. | Systeembestanden | Darik's Boot And Nuke Kernel Data | Darik's Boot And Nuke | GEEP EDS LLC. |
| .C++ | Bjarne Stroustrup | Systeembestanden | C++ Implementation Files | C++ | Bjarne Stroustrup |
| .C2I | Unknown Developer | Systeembestanden | Driver File | Unknown Software | Unknown Developer |
| .CAB | Microsoft Corporation | Systeembestanden | Windows Cabinet File | 7-Zip | Igor Pavlov |
| .CAP | Microsoft Corporation | Systeembestanden | Network Monitor Packet Capture Data File | Microsoft Network Monitor | Microsoft Corporation |
| .CAT | Microsoft Corporation | Systeembestanden | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CB | Microsoft Corporation | Systeembestanden | Microsoft Clean Boot File | Microsoft Windows | Microsoft Corporation |
| .CDD | CS Odessa | Systeembestanden | ConceptDraw PRO Document | ConceptDraw PRO | CS Odessa |
| .CDJ | Padus Software | Systeembestanden | Disc Juggler File | DiscJuggler | Padus Software |
| .CDMP | Microsoft Corporation | Systeembestanden | WCS Device Model Profile | Microsoft Windows | Microsoft Corporation |
| .CGZ | Wouter van Oortmerssen | Systeembestanden | Cube Map File | Cube | Wouter van Oortmerssen |
| .CHG | Quicken | Systeembestanden | Quicken Online Data File | Intuit Quicken | Quicken |
| .CHS | Microsoft Corporation | Systeembestanden | Windows Chinese Noise-Word List File | Microsoft Windows | Microsoft Corporation |
| .CHT | Nintendo | Systeembestanden | SNES Cheat File | ZSNES | Nintendo |
| .CI | Microsoft Corporation | Systeembestanden | Windows Content Indexer Catalog File | Microsoft Windows | Microsoft Corporation |
| .CLB | Microsoft Corporation | Systeembestanden | COM+ Catalog File | Microsoft COM+ | Microsoft Corporation |
| .CLG | Microsoft Corporation | Systeembestanden | Windows Catalog File | Microsoft Windows | Microsoft Corporation |
| .CM0013 | Samsung Electronics | Systeembestanden | Samsung Smart TV Index File | Microsoft Word | Microsoft Corporation |
| .CMO | ASUS | Systeembestanden | ASUS BIOS File | Microsoft Windows | Microsoft Corporation |
| .CMP | Microsoft Corporation | Systeembestanden | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .CNT | Microsoft Corporation | Systeembestanden | Help Contents File | Microsoft HTML Help Workshop | Microsoft Corporation |
| .CPI | Sony | Systeembestanden | AVCHD Video Clip Information | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .CPL | Microsoft Corporation | Systeembestanden | Windows Control Panel Item | Microsoft Windows | Microsoft Corporation |
| .CPQ | Compaq | Systeembestanden | Compaq OEM Disc Configuration File | Microsoft Notepad | Microsoft Corporation |
| .CPR | Steinberg | Systeembestanden | Cubase Project | Steinberg Cubase | Steinberg |
| .CQ | Open Source | Systeembestanden | SYSGEN Replacement Data | CP/M | Open Source |
| .CRASH | Apple | Systeembestanden | Mac OS X Crash Log File | Apple TextEdit | Apple |
| .CUR | Unknown Developer | Systeembestanden | Windows Cursor File | ACD Systems ACDSee | ACD Systems |
| .DAVMOUNT | Microsoft Corporation | Systeembestanden | Windows Based Script Host | Microsoft Windows | Microsoft Corporation |
| .DBL | Microsoft Corporation | Systeembestanden | Microsoft Windows XP Product Activation Data | Windows XP | Microsoft Corporation |
| .DDT | Sports Interactive | Systeembestanden | Football Manager Keep Player Data File | Football Manager 2016 | Sports Interactive |
| .DDZ | AT&T Labs | Systeembestanden | Adaptec SCO Unix Driver Image | Unix | AT&T Labs |
| .DESKLINK | Microsoft Corporation | Systeembestanden | Desktop Shortcut | Microsoft Windows | Microsoft Corporation |
| .DESKTHEMEPACK | Microsoft Corporation | Systeembestanden | Microsoft Windows Theme Pack | Microsoft Windows 8 | Microsoft Corporation |
| .DEV | Bloodshed Software | Systeembestanden | Dev-C++ Project File | Dev-C++ | Bloodshed Software |
| .DEVICEMANIFEST-MS | Microsoft Corporation | Systeembestanden | Microsoft Windows Device Metadata | Microsoft Windows | Microsoft Corporation |
| .DEVICEMETADATA-MS | Microsoft Corporation | Systeembestanden | Device Metadata Package | Microsoft Windows | Microsoft Corporation |
| .DFU | Apple | Systeembestanden | iOS DFU File | Apple iOS | Apple |
| .DIAGCAB | Microsoft Corporation | Systeembestanden | Troubleshooting Pack Cabinet File | Microsoft Windows | Microsoft Corporation |
| .DIAGCFG | Microsoft Corporation | Systeembestanden | Troubleshooting Pack Configuration File | Microsoft Support Diagnostic Tool | Microsoft Corporation |
| .DIAGPKG | Microsoft Corporation | Systeembestanden | Troubleshooting Pack File | Microsoft Support Diagnostic Tool | Microsoft Corporation |
| .DIT | Microsoft Corporation | Systeembestanden | Active Directory Information Tree File | Microsoft Active Directory | Microsoft Corporation |
| .DL4 | Lindab | Systeembestanden | Lindab Dimsilencer File | DIMsilencer | Lindab |
| .DLL | Microsoft Corporation | Systeembestanden | Dynamic Link Library | Microsoft Visual FoxPro | Microsoft Corporation |
| .DLX | DIAL | Systeembestanden | DIALux Document | DIAL DIALux | DIAL |
| .DMD | Oracle Corporation | Systeembestanden | SQL Developer Data Modeler File | SQL Developer Data Model | Oracle Corporation |
| .DMP | Microsoft Corporation | Systeembestanden | Windows Memory Dump File | Microsoft Visual Studio | Microsoft Corporation |
| .DOH | Geoworks Ensemble | Systeembestanden | Geoworks Dependency Information File | GEOS (Graphic Environment Operating System) | Geoworks Ensemble |
| .DPB | Susteen, Inc. | Systeembestanden | DataPilot Backup File | DataPilot | Susteen, Inc. |
| .DRV | Microsoft Corporation | Systeembestanden | Device Driver | Microsoft Windows | Microsoft Corporation |
| .DS | DAZ 3D | Systeembestanden | DAZ Studio 1/2 Script | DAZ Studio | DAZ 3D |
| .DSK | Power Software Ltd | Systeembestanden | General Disk Image | PowerISO | Power Software Ltd |
| .DSR | Activision | Systeembestanden | Modern Warfare 3 Dedicated Server Recipe File | Call of Duty 4: Modern Warfare | Activision |
| .DSS | The International Voice Association (IVA) | Systeembestanden | Digital Speech Standard File | DSS Player Lite | Olympus Corporation |
| .DTHUMB | Google | Systeembestanden | Android Data Thumbnail | Google Android | Google |
| .DUMP | Microsoft Corporation | Systeembestanden | Dump File | macOS | Apple |
| .DVC | IBM | Systeembestanden | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
| .DVD | Unknown Developer | Systeembestanden | DOS Device Driver | MS-DOS | Microsoft Corporation |
| .DYC | Xerox | Systeembestanden | Xerox Printer Driver Configuration File | Xerox CentreWare | Xerox |
| .DYL | Psion PLC | Systeembestanden | EPOC16:Dynamic Link Library File | EPOC (operating system) | Psion PLC |
| .EBD | Microsoft Corporation | Systeembestanden | Windows EBD System File | Microsoft Windows | Microsoft Corporation |
| .ECD | EUROSYSTEMS | Systeembestanden | CoCut Plotter Printer Driver | Cocut | EUROSYSTEMS |
| .EFI | Intel Corporation | Systeembestanden | Extensible Firmware Interface File | EFI Developer Kit | Slashdot Media |
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