| 141. | .dsp | Display parameters (Signature) ◊ Dynamic Studio Professional Module (Dynamic Studio) ◊ Graphics display driver (Dr.Halo) ◊ Project (Microsoft Developer Studio) |
| 142. | .dsq | Query file (Corel) |
| 143. | .dsr | Driver Resource (WordPerfect) ◊ Visual Basic Active designer file |
| 144. | .dss | Screensaver file (DCC) ◊ Sound (Digital Soup) |
| 145. | .dst | Distribution file (PC-RDist, by Pyzzo) ◊ Embroidery machines graphics data ◊ WAIN (Scanner spec) data source DLL (Win) |
| 146. | .dsw | Project workspace (Borland C++ - Microsoft Developer Studio) |
| 147. | .dsx | Visual Basic Active designer binary file |
| 148. | .dt_ | Data fork of a Macintosh file (Mac-ette) |
| 149. | .dta | Data file (Turbo Pascal - PC-File - Stata) ◊ World Bank's STARS data |
| 150. | .dtd | SGML Document Type Definition (DTD) |