Opening a CKO File

The CKO file type is primarily associated with KnockOut 2.

CKO	File extension: CKO
	File type:	Image Mask

What is a CKO file?

CKO files mostly belong to 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.

How to open a CKO file

You need a suitable software like KnockOut 2 to open a CKO file. You need a suitable software like KnockOut 2 from Corel to open a CKO file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CKO file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CKO file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CKO Text Viewer

Choose your .cko file to analyze

or drag and drop it here

Online File Viewer

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4 Steps to Open an Unknown .CKO File

Because .CKO files may originate from various programs, they aren't universally openable.

Identify the Source: A file received from a graphic designer or photo editing workflow strongly suggests a Corel KnockOut 2 Image Mask file.
Check the Header: Inspect the first few bytes using a text or hex editor.
- "PK" indicates a zipped archive.
- Readable XML/JSON suggests a configuration file.
- Unreadable binary data implies a proprietary graphic format.
Use the Original Software: The original program is usually required; try Corel KnockOut 2, Corel PaintShop Pro, or ask the sender if uncertain.
Use this Webpage: Drag and drop your file into our viewer to detect the format, extract readable text/metadata, and preview when possible.

Technical Data for CKO File Extension

File classification:

Graphic

Related files:

cph, wpg, abx

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: CB_CKOFormat (cko)
EXEFile: %ProgramFiles%\ChessBase\CBReader\CBReader.exe

a cko Image Mask is a special file format by Corel and should only be edited and saved with the appropriate software.

How to solve problems with CKO files

Associate the CKO file extension with the correct application.
Update your software that should actually open image masks. Because only the current version supports the latest CKO file format. Search, therefore, e.g. on the Corel manufacturer website after an available KnockOut 2 update.
To make sure that your CKO file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CKO file online - secure, fast, and no downloads needed.