| dt4 | BioSonics DT-X Data |
| dt5 | BK Backup Data |
| dt6 | BK Backup Data |
| dta | Chain Calculator Database |
| dta | EZ-Forms Data File |
| dtapart | DownThemAll! Partially Downloaded File |
| dtb | DataCAD Custom Toolbar |
| dtb2 | Timbuktu Pro DropIn Data |
| dtcp | Philips SuperAuthor DTCP Data |
| dte | Digital Terrain Elevation Data |
| dte | DoroTree Family Tree Data |
| dted | Digital Terrain Elevation Data |
| dtermlicence | DTerm Licence Data |
| dtf | Lotus Domino Server Temporary Data |
| dtf | Symantec Q&A Database Data |
| dtfx | IBM i Access Data Transfer from IBM i |
| dthumb | Android Thumbnail Data |
| dtl | Pro/ENGINEER Detail Options Setup Data |
| dtl | Weintek HMI Data Log File |
| dtm | Bentley InRoads Digital Terrain Model |
| dtm | SmartWare Appointment Data |
| dtn | TunnelCAD Input/Output File |
| dto | Digital Terrain Elevation Data |
| dto | Directory Toolkit Output Data |
| dto | Ditto Exported Data |
| dtp | DMDX Binary DTP Data |
| dtr | DATroniC Data Recording |
| dtr | DiagTransfer Chess Diagram |
| dtr | Swisslog Downtime Analyzer Report |
| dts | Directory Toolkit Script |
