| 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 |
|---|---|---|---|
| .Y01 | Corel Corporation | Data Files | Corel Paradox Secondary Index |
| .SHW | Corel | Data Files | Corel Presentations Slide Show |
| .MP4V | Moving Picture Experts Group | Video Files | MPEG-4 Video File |
| .ZQV | Check Point Software Technologies Ltd. | Data Files | ZoneAlarm Mailsafe Renamed Data |
| .SMP | MakeMusic, Inc. | Audio Files | SmartMusic Performance File |
| .MU | Squad | 3D Image Files | Kerbal Space Program Mesh File |
| .ZQU | Check Point Software Technologies Ltd. | Data Files | ZoneAlarm Mailsafe Renamed Data |
| .ZOM | Check Point Software Technologies Ltd. | Data Files | ZoneAlarm Mailsafe Renamed Data |
| .WQ0 | Corel | Spreadsheet Files | Quattro Pro For DOS Spreadsheet File |
| .README | The Document Foundation | Text Files | Readme Text Document File |
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