| 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 |
|---|---|---|---|
| .CIX | IBM | Data Files | Rational XDE |
| .UID | IBM | Data Files | IBM VoiceType User Data File |
| .PRC | Adobe Systems Incorporated | 3D Image Files | Product Representation Compact File |
| .IMP | Lotus Software | Spreadsheet Files | Improv Spreadsheet File |
| .TTW | IBM | Text Files | IBM Rational Tau Workspace |
| .EID | IBM | Data Files | IBM Voice Type Languages Newuser File |
| .RUP | IBM | Data Files | IBM Rational Unified Process Data |
| .MDX | Disc Soft Ltd. | Disk Image Files | Extended Media Descriptor File |
| .UCX | IBM | Data Files | Rational XDE Data |
| .INN | Micro Focus International plc | Uncommon Files | Micro Focus COBOL/2 Overlay File |
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