| docktheme | Stardock ObjectDock Theme |
| dod | Progress Artix Data Services Data Model |
| doe | Arena Model File |
| doi | BiRT Data Object Instance |
| dol | Gamecube Executable DOL |
| dom | DIMPLOT Domain Definition |
| don | PLS-CADD Lines and Annotation Data |
| dop | DOpus Toolbar File |
| dop | DxO Optics Pro Sidecar File |
| doq | Digital Orthophoto Quadrangle Data |
| dot | Ribbons Dot Definition |
| dov | BiRT Actuate Query Definition File |
| dp2 | DatePad 2 Data |
| dp4 | Actuate Analytics Cube Profile |
| dpatch | Dpatch Patch Data |
| dpb | DataPilot Data |
| dpcache | Apple iPhoto Desktop Photos Cache |
| dpe | DPwinEHE Calculation |
| dpf | F-Secure Default Policy File |
| dpf | COMPRESS Drafter Data |
| dph | BAT Detector Plane Histogram Data |
| dpi | Adlib Express Document Processing Information |
| dply | RootCause Deploy Data |
| dpr | ASReml Double Precision Binary Data |
| dpsml | PSML Dynamic Page Definition |
| dpu | Advanced DHTML Popup Package |
| dpv | Siemens NX Drafting Standard |
| dpz | IBM SPSS Deployment Package |
| dqa | Daqarta Data File |
| dql | DataEase Database |
| dqr | FIU-IND Data Quality Report |
| dr | OMA DRM Rights Object XML |
| dra | Dragon Recorded Audio |
| drag | EdGCM Data |
| drb | Dr. Beam Pro Data |
