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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DBF | dBase, LLC | GIS Files | Database File | Microsoft Excel | Microsoft Corporation |
| .DEM | Valve | GIS Files | Video Game Demo File | VirtualDub | Open Source |
| .DGF | Trimble Inc. | GIS Files | GPS Pathfinder Office Geoid Grid File | GPS Pathfinder Office Software | Trimble Inc. |
| .DIV | Robert Hijmans | GIS Files | DIVA-GIS Project File | DIVA-GIS | Robert Hijmans |
| .DIX | Robert Hijmans | GIS Files | DIVA-GIS Export File | DIVA-GIS | Robert Hijmans |
| .DLG | Crytek | GIS Files | Crysis Dialogue Data File | Crysis | Crytek |
| .DMF | Geosystem | GIS Files | Geosystem Digitals Map File | Geosystem Digitals | Geosystem |
| .DMT | DeLorme | GIS Files | XMap Transfer File | XMap | Garmin |
| .DT0 | National Geospatial-Intelligence Agency | GIS Files | DTED Level 0 File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .DT1 | National Geospatial-Intelligence Agency | GIS Files | DTED Level 1 File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .DT2 | Microsoft Corporation | GIS Files | Windows Live Messenger Emoticon Image File | Microsoft Windows Live Messenger | Microsoft Corporation |
| .DVC | IBM | GIS Files | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
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