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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .DCF | Sony Mobile Communications | Audio Files | DRM Content Format File | Taskmaster | IBM |
| .DGM | IBM | Graphic Files | IBM Lotus Freelance Graphics Diagram Data | Lotus Freelance Graphics | IBM |
| .DGX | IBM | Data Files | IBM Rational XDE Diagram | Rational XDE | IBM |
| .DLD | Campbell Scientific | Executable Files | EdLog Compiled Program | Lotus 1-2-3 | IBM |
| .DMD | Oracle Corporation | Developer Files | SQL Developer Data Modeler File | OS/2 | IBM |
| .DO | Unknown Developer | Web Files | Java Servlet | WebSphere Application Server | IBM |
| .DTF | IBM | Uncommon Files | Domino Temporary File | IBM Domino | IBM |
| .DVC | IBM | Data Files | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
| .DW4 | IBM | Data Files | Visio/DisplayWrite 4 Text File | DisplayWrite | IBM |
| .DXL | IBM | Database Files | Domino XML Language File | IBM Domino | IBM |
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