| Extension | File Description |
| .DT7 | Uncommon Files |
| .DT8 | Uncommon Files |
| .DT9 | Uncommon Files |
| .DT? | GIS Files |
| .DTA | Data Files |
| .DTAUS | Uncommon Files |
| .DTAZV | Uncommon Files |
| .DTB | Uncommon Files |
| .DTC | Uncommon Files |
| .DTD | Data Files |
| .DTE | Uncommon Files |
| .DTEA | Uncommon Files |
| .DTED | Uncommon Files |
| .DTERMLICEN | Uncommon Files |
| .DTF | Misc Files |
| .DTG | Uncommon Files |
| .DTH | Uncommon Files |
| .DTI | Uncommon Files |
| .DTJ | Uncommon Files |
| .DTK | Uncommon Files |
| .DTL | Uncommon Files |
| .DTM | Audio Files |
| .DTN | Uncommon Files |
| .DTO | Uncommon Files |
| .DTP | Page Layout Files |
| .DTQ | Uncommon Files |
| .DTR | Data Files |
| .DTS | Audio Files |
| .DTSHD | Audio Files |
| .DTT | Uncommon Files |
| .DTU | Uncommon Files |
| .DTV | Uncommon Files |
| .DTW | Raster Image Files |
| .DTX | Page Layout Files |
| .DTY | Uncommon Files |
| .DTZ | Uncommon Files |
| .DT_ | Misc Files |
| .DU0 | Uncommon Files |
| .DU1 | Uncommon Files |
| .DU2 | Uncommon Files |
| .DU3 | Uncommon Files |
| .DU4 | Uncommon Files |
| .DU5 | Uncommon Files |
| .DU6 | Uncommon Files |
| .DU7 | Uncommon Files |
| .DU8 | Uncommon Files |
| .DU9 | Uncommon Files |
| .DUA | Uncommon Files |
| .DUB | Uncommon Files |
| .DUC | Game Files |
| .DUCF | Uncommon Files |
| .DUCK | Settings Files |
| .DUCX-BP | Uncommon Files |
| .DUCX-CU | Uncommon Files |
| .DUCX-OM | Uncommon Files |
| .DUCX-OS | Uncommon Files |
| .DUCX-RS | Uncommon Files |
| .DUCX-UC | Uncommon Files |
| .DUCX-UI | Uncommon Files |
| .DUCX-XP | Uncommon Files |
| .DUD | Uncommon Files |
| .DUE | Uncommon Files |
| .DUEL | Uncommon Files |
| .DUET | Uncommon Files |
| .DUF | Uncommon Files |
| .DUG | Uncommon Files |
| .DUH | Uncommon Files |
| .DUI | Uncommon Files |
| .DUJ | Uncommon Files |
| .DUK | Uncommon Files |
| .DUL | Uncommon Files |
| .DUM | Uncommon Files |
| .DUMP | Misc Files |
| .DUN | Settings Files |
| .DUNGEON | Uncommon Files |
| Extension | File Description |
| .DUO | Uncommon Files |
| .DUP | Uncommon Files |
| .DUPLICATEZ | Uncommon Files |
| .DUPX | Uncommon Files |
| .DUQ | Uncommon Files |
| .DUR | Uncommon Files |
| .DUS | Misc Files |
| .DUSTCLOUD | Uncommon Files |
| .DUT | Uncommon Files |
| .DUU | Uncommon Files |
| .DUV | Uncommon Files |
| .DUW | Uncommon Files |
| .DUX | Uncommon Files |
| .DUY | Uncommon Files |
| .DUZ | Uncommon Files |
| .DV | Video Files |
| .DV0 | Uncommon Files |
| .DV1 | Uncommon Files |
| .DV2 | Uncommon Files |
| .DV3 | Uncommon Files |
| .DV4 | Uncommon Files |
| .DV5 | Uncommon Files |
| .DV6 | Uncommon Files |
| .DV7 | Uncommon Files |
| .DV8 | Uncommon Files |
| .DV9 | Uncommon Files |
| .DVA | Uncommon Files |
| .DVB | Uncommon Files |
| .DVC | Uncommon Files |
| .DVD | Disk Image Files |
| .DVDFABHDDE | Uncommon Files |
| .DVDFABPLAT | Uncommon Files |
| .DVDMOVIE | Uncommon Files |
| .DVDPROJ | Data Files |
| .DVDREGIONC | Uncommon Files |
| .DVDRIP | Uncommon Files |
| .DVDRIP-INF | Uncommon Files |
| .DVE | Uncommon Files |
| .DVF | Audio Files |
| .DVG | Uncommon Files |
| .DVH | Uncommon Files |
| .DVI | Text Files |
| .DVJ | Uncommon Files |
| .DVK | Uncommon Files |
| .DVL | Uncommon Files |
| .DVM | Uncommon Files |
| .DVN | Uncommon Files |
| .DVO | Data Files |
| .DVP | Uncommon Files |
| .DVPRJ | Uncommon Files |
| .DVQ | Uncommon Files |
| .DVR | Video Files |
| .DVR-MS | Video Files |
| .DVS | Uncommon Files |
| .DVSD | Uncommon Files |
| .DVT | Uncommon Files |
| .DVU | Uncommon Files |
| .DVV | Uncommon Files |
| .DVW | Uncommon Files |
| .DVX | Video Files |
| .DVY | Uncommon Files |
| .DVZ | Uncommon Files |
| .DW | Uncommon Files |
| .DW0 | Uncommon Files |
| .DW1 | Uncommon Files |
| .DW2 | Uncommon Files |
| .DW3 | Uncommon Files |
| .DW4 | Uncommon Files |
| .DW5 | Uncommon Files |
| .DW6 | Uncommon Files |
| .DW7 | Uncommon Files |
| .DW8 | Uncommon Files |
| .DW9 | Uncommon Files |
| .DWA | Audio Files |
| .DWARF | Uncommon Files |
