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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .DA0 | Microsoft Corporation | Backup Files | Windows Registry Backup File | Should Not Be Opened Manually | Unknown Developer |
| .DBA | PDC (Prolog Development Center) | Backup Files | Turbo Prolog Database | Visual Prolog | PDC (Prolog Development Center) |
| .DBE | Microsoft Corporation | Backup Files | ActiveSync Backup File Format | Microsoft ActiveSync | Microsoft Corporation |
| .DBK | Sony | Backup Files | Sony Ericsson Mobile Phone Backup File | WinRAR | Eugene Roshal |
| .DBQ | Corel | Backup Files | Corel Paradox Memo Data | Corel Paradox | Corel |
| .DIM | Active@ Data Recovery Software | Backup Files | Active@ Raw Disk Image Backup File | Active@ Disk Image | LSoft Technologies Inc. |
| .DIY | Huntersoft | Backup Files | My Drivers Backup Setup File | My Drivers | Huntersoft |
| .DMD | Oracle Corporation | Backup Files | SQL Developer Data Modeler File | SQL Developer Data Model | Oracle Corporation |
| .DNA | GSL Biotech LLC | Backup Files | SnapGene DNA File | SnapGene | GSL Biotech LLC |
| .DPB | Susteen, Inc. | Backup Files | DataPilot Backup File | DataPilot | Susteen, Inc. |
| .DSB | Dell Technologies | Backup Files | Dell DataSafe Backup File | DataSafe Local Backup | Dell Technologies |
| .DSS | The International Voice Association (IVA) | Backup Files | Digital Speech Standard File | DSS Player Lite | Olympus Corporation |
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