| File Extension: | 4DK |
| File Type Description: | OS/2 Saved SKF Format File |
| File Type Developer: | IBM |
| Primary Associated Software: | OS/2 |
| Primary Software Developer: | IBM |
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| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .U2P | IBM | Developer Files | Telelogic Tau UML Program Text File |
| .COL | Open Source | Data Files | Bibexcel File |
| .NS3 | IBM | Database Files | Lotus Notes 3 Database |
| .NRF | The Neat Company | Data Files | Neat Document Folder File |
| .LWP | IBM | Text Files | Lotus Word Pro Document |
| .SGT | IBM | Settings Files | SPSS Chart Template File |
| .SPP | Serif | Raster Image Files | Serif PhotoPlus Picture File |
| .QF | Nokia | Settings Files | Nokia (Ovi) Maps Version Data |
| .NTS | IBM | Settings Files | Lotus Notes Traveler Server Config File |
| .LSS | IBM | Developer Files | LotusScript Source Code |
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