| dmn | SAS Stat Studio Metadata |
| dmo | TI Derive Demo |
| dmp | DB/TextWorks Exported Records File |
| dmp | Windows Memory Dump |
| dmpx | Oracle Database Application Dump |
| dmsk | DivX Temporary Video Data |
| dmv | Adobe Acrobat Parsing Rules |
| dmw | Datamass Ag Data |
| dmy | LTSTDB Time Series Data |
| dnb | Microsoft Windows Binary DNS Database |
| dnc | DANCE Database |
| dnd | ClustalW2 Guide Tree Data |
| dne | Netica ASCII Text Data |
| dnet | Netica ASCII Text Data |
| dnk | KillAd Data |
| dns | Microsoft Windows DNS Server Database |
| dockzip | ObjectDock |
| 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 |
| dot | Ribbons Dot Definition |
| dov | BiRT Actuate Query Definition File |
| dp1 | DataPower Database |
| dp2 | DatePad 2 Data |
| dpatch | Dpatch Patch Data |
