Notes about the CKO file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The CKO file type is primarily associated with 'KnockOut 2' by Corel. Corel KnockOut 2 increases the quality of your photo composites by letting you preserve fine image details that were once impossible to mask precisely; e.g., hair, smoke, shadows, water, transparencies and any blurred or out-of-focus edges can now be masked.