| dc1 | OpenBSD Interface Configuration Data |
| dcc | Nokia Dynamic Camera Configuration |
| dcf | Arbortext Editor Document Type Configuration Data |
| dcf | CANopen Device Configuration Data |
| dcf | DynSite Configuration Data |
| dcf | HP 95LX Comm Program Settings Data |
| dcls | Catia V4 Settings |
| dcp | Adobe DNG Camera Profile |
| dcpr | Adobe DNG Camera Profile Recipe |
| dcst | Adobe InDesign Document Settings |
| def | Binary Editor Definition Data |
| defs | Linux Shadow Password Suite Configuration |
| deft | Juice Grinder Defaults |
| deny | TCP Wrapper Access List Data |
| depot | HP-UX Software Distributor Catalog Depot |
| desktop | Desktop Entry |
| dev | GFI FAXmaker Device Configuration |
| dfc | DeSmuME Firmware Configuration |
| dfrocfg | SUMO dfrouter Configuration |
| diagcfg | Windows Troubleshooting Pack Configuration |
| dirac | DIRAC Configuration Data |
| dkm | DynaComm Asynchronous Keyboard Mapping |
| dks | PowerQuest DataKeeper Settings Data |
| dlf | FlashFXP Default Language Data |
| dmc | DAZ 3D Mimic Configuration |
| dmi | STATISTICA Node Interface Configuration |
| dmms | iMindQ Mind Map Style |
| dno | DriveTools SP DriveExecutive Parameters |
| docc | DragThing Color Settings |
| dok | DesktopOK Icons Layout |
| dolphinview | Dolphin Folder View Settings |
| dpf | DOpus v9 Preferences Data |
| dps | DOpus Exported Settings |
| dpst | DYNAMICS Presets Data |
| dr2 | Aurora Data Resource Definition |
