| .def |
M.U.G.E.N. Character Definition File |
| .dmf |
Geosystem Digitals Map File |
| .dgc |
DGCA File Archive |
| .dpg |
Nintendo DS Movie File |
| .drm |
Deus Ex Data File |
| .dam |
DeltaMaster Analysis Model |
| .dpp |
DrawPlus Drawing File |
| .dol |
GameCube Executable File |
| .dff |
RenderWare Model File |
| .dax |
PSP Compressed ISO Disc Image |
| .dts |
DTS Encoded Audio File |
| .dco |
Safetica Free Encrypted Virtual Disk Archive |
| .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 |
| .drg |
AllyCAD Drawing File |