| File Extension: | CKO |
| File Type Description: | Image Mask File |
| File Type Developer: | Corel |
| Primary Associated Software: | Corel KnockOut 2 |
| Primary Software Developer: | Corel |
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Image Mask File files are the most popular type of files to carry the CKO file extension, originally developed by Corel for Corel KnockOut 2. Internal website statistics show that CKO files are most popular with users in United States and those running the Windows 10 operating system. Google Chrome is their primary internet browser for the bulk of these users.
 | Corel KnockOut 2 by Corel |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .UDI | Pinnacle Systems Inc. | Uncommon Files | Dazzle DVD Complete File |
| .SGM | VBA Team | Game Files | VisualBoyAdvance Saved Game |
| .WFN | Corel | Font Files | Corel Font Or Symbol File |
| .ZMA | Interscape | Data Files | Impedance File |
| .ZNS | Check Point Software Technologies Ltd. | Data Files | ZoneAlarm Mailsafe Renamed Data |
| .ZLC | Check Point Software Technologies Ltd. | Data Files | ZoneAlarm Mailsafe Renamed Data |
| .UFO | Ulead Systems | Raster Image Files | Ulead File Object |
| .CLK | Corel | Data Files | Corel R.A.V.E Project File |
| .UOL | Ulead Systems | Graphic Files | PhotoImpact Clipart Image |
| .GAP | Ulead Systems | Settings Files | PhotoImpact Pencil Style Data |
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