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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DAVMOUNT | Microsoft Corporation | System Files | Windows Based Script Host | Microsoft Windows | Microsoft Corporation |
| .DBL | Microsoft Corporation | System Files | Microsoft Windows XP Product Activation Data | Windows XP | Microsoft Corporation |
| .DDT | Sports Interactive | System Files | Football Manager Keep Player Data File | Football Manager 2016 | Sports Interactive |
| .DDZ | AT&T Labs | System Files | Adaptec SCO Unix Driver Image | Unix | AT&T Labs |
| .DESKLINK | Microsoft Corporation | System Files | Desktop Shortcut | Microsoft Windows | Microsoft Corporation |
| .DESKTHEMEPACK | Microsoft Corporation | System Files | Microsoft Windows Theme Pack | Microsoft Windows 8 | Microsoft Corporation |
| .DEV | Bloodshed Software | System Files | Dev-C++ Project File | Dev-C++ | Bloodshed Software |
| .DEVICEMANIFEST-MS | Microsoft Corporation | System Files | Microsoft Windows Device Metadata | Microsoft Windows | Microsoft Corporation |
| .DEVICEMETADATA-MS | Microsoft Corporation | System Files | Device Metadata Package | Microsoft Windows | Microsoft Corporation |
| .DFU | Apple | System Files | iOS DFU File | Apple iOS | Apple |
| .DIAGCAB | Microsoft Corporation | System Files | Troubleshooting Pack Cabinet File | Microsoft Windows | Microsoft Corporation |
| .DIAGCFG | Microsoft Corporation | System Files | Troubleshooting Pack Configuration File | Microsoft Support Diagnostic Tool | Microsoft Corporation |
| .DIAGPKG | Microsoft Corporation | System Files | Troubleshooting Pack File | Microsoft Support Diagnostic Tool | Microsoft Corporation |
| .DIT | Microsoft Corporation | System Files | Active Directory Information Tree File | Microsoft Active Directory | Microsoft Corporation |
| .DL4 | Lindab | System Files | Lindab Dimsilencer File | DIMsilencer | Lindab |
| .DLL | Microsoft Corporation | System Files | Dynamic Link Library | Microsoft Visual FoxPro | Microsoft Corporation |
| .DLX | DIAL | System Files | DIALux Document | DIAL DIALux | DIAL |
| .DMD | Oracle Corporation | System Files | SQL Developer Data Modeler File | SQL Developer Data Model | Oracle Corporation |
| .DMP | Microsoft Corporation | System Files | Windows Memory Dump File | Microsoft Visual Studio | Microsoft Corporation |
| .DOH | Geoworks Ensemble | System Files | Geoworks Dependency Information File | GEOS (Graphic Environment Operating System) | Geoworks Ensemble |
| .DPB | Susteen, Inc. | System Files | DataPilot Backup File | DataPilot | Susteen, Inc. |
| .DRV | Microsoft Corporation | System Files | Device Driver | Microsoft Windows | Microsoft Corporation |
| .DS | DAZ 3D | System Files | DAZ Studio 1/2 Script | DAZ Studio | DAZ 3D |
| .DSK | Power Software Ltd | System Files | General Disk Image | PowerISO | Power Software Ltd |
| .DSR | Activision | System Files | Modern Warfare 3 Dedicated Server Recipe File | Call of Duty 4: Modern Warfare | Activision |
| .DSS | The International Voice Association (IVA) | System Files | Digital Speech Standard File | DSS Player Lite | Olympus Corporation |
| .DTHUMB | System Files | Android Data Thumbnail | Google Android | ||
| .DUMP | Microsoft Corporation | System Files | Dump File | macOS | Apple |
| .DVC | IBM | System Files | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
| .DVD | Unknown Developer | System Files | DOS Device Driver | MS-DOS | Microsoft Corporation |
| .DYC | Xerox | System Files | Xerox Printer Driver Configuration File | Xerox CentreWare | Xerox |
| .DYL | Psion PLC | System Files | EPOC16:Dynamic Link Library File | EPOC (operating system) | Psion PLC |
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