| .dtr |
DATroniC Data Recording |
| .dtw |
Desktop Wallpaper |
| .dwfx |
Design Web Format XPS File |
| .dbo |
DarkBASIC Object |
| .dt0 |
DTED Level 0 File |
| .dna |
SnapGene DNA File |
| .dtshd |
DTS-HD Master Audio File |
| .dnl |
DNAML eBook File |
| .dck |
Resolume Deck File |
| .dl |
Zoo Tycoon 2 Data File |
| .ddt |
Football Manager Keep Player Data File |
| .db3 |
SQLite Database File |
| .dvo |
Cook'n Cookbook File |
| .dmss |
VideoWave SlideShow Project File |
| .dlv |
CATIA 4 Export File |
| .dxp |
CDBurnerXP Data Compilation File |
| .drg |
AllyCAD Drawing File |
| .dgk |
Delcam 3D Model File |
| .dcover |
Disc Cover File |
| .dmc |
Datamartist Data Canvas File |
| .dwlibrary |
Paperless Document Library |
| .dv-avi |
Microsoft DV-AVI Video File |
| .dlu |
3ds Max Utility Plug-in File |
| .dsd |
AutoCAD Drawing Set Description File |