| dtt | Data Transfer To iSeries File |
| dttx | IBM i Access Data Transfer to IBM i |
| dtw | My Better Desktop Layout |
| dtxml | Across DisplayText XML Data |
| dty | Bentley Map Dictionary Data |
| dtyp | DTYPE Database |
| dtype | DTYPE Database |
| dubaskin | Kingsoft Internet Security Skin |
| duc | Action Replay DS Max Save |
| ducf | DinkeyChange Update Code |
| duck | Cyberduck Bookmark |
| dud | DirectUpdate Data |
| duf | DSON User File |
| duh | Autodesk Storm and Sanitary Analysis DUH Data |
| duid | DHCP Unique Identifiers Data |
| dum | CODESYS Device User Management Data |
| dump | BreakPad Crash Log Data |
| dup0 | Samsung Kies Duplicate Media Data |
| dup1 | Samsung Kies Duplicate Media Data |
| dup2 | Samsung Kies Duplicate Media Data |
| dupeguru | DupeGuru Duplicate List |
| dus | Readiris Font Dictionary |
| dut | Keysight PLTS Corrected Measurement Data |
| dvc | Dragon NaturallySpeaking Vocabulary |
| dvc | Lotus 1-2-3 DVC Data |
| dvdfab5 | DVDFab Data |
| dvdfab6 | DVDFab Data |
| dve | Video Toaster Digital Video Effect |
| dvfh | D-Link IP Camera Metadata |
| dvl | Active Safety System Communication Log |
