| ds_store | Mac OS X Folder Settings |
| dt | Proben1 Dataset |
| dt0 | DTED Level 0 Data |
| dt1 | DTED Level 1 Data |
| dt2 | DTED Level 2 Data |
| dt5 | BK Backup Data |
| dt6 | BK Backup Data |
| dta | Chain Calculator Database |
| dta | EZ-Forms Data File |
| dtapart | DownThemAll! Partially Downloaded File |
| dtcp | Philips SuperAuthor DTCP Data |
| dte | DoroTree Family Tree Data |
| dte | Digital Terrain Elevation Data |
| dted | Digital Terrain Elevation Data |
| dtf | Symantec Q&A Database Data |
| dtfx | IBM i Access Data Transfer from IBM i |
| dthumb | Android Thumbnail Data |
| dtl | Weintek HMI Data Log File |
| 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 |
| dts | Dynatrace AppMon Exported Session Data |
| dtsearch | dtSearch Configuration Data |
| dtsf | Dynatrace AppMon Stored Session Data |
| dtswa | FantasyDVD Player Platinum Data |
| dtsx | Microsoft SQL Server Integration Services Package |
| 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 |