Files with the .cwk extension can only be launched by certain applications. ClarisWorks was acquired by Apple in 1998 and renamed AppleWorks. Both were available in Mac and Windows versions. The CWK file extension is mainly known for its use in Apple ClarisWorks, a now discontinued office suite. The CWK file may contain a word processing document, spreadsheet, presentation, or even drawing.
If you own old ClarisWorks files, but not ClarisWorks, open the documents in a text editor and copy paste texts out. No current word processors support this file format. CWK files saved data in plain text format with text markup. The only way to access data is to open with a text editor and copy content.
CWK file format is compatible with software installable on Mac OS and Windows. Files with .cwk extension are Data Files. Users should use AppleWorks, although 4 other programs handle this file type too.
To open .cwk files, download and install the appropriate program. Depending on your operating system, you may need different software. There are 3 programs available for desktop PCs, including 2 for Mac OS and 2 for Windows.
When Windows does not recognize an extension, you receive a message to select an app. Update the application you normally use to open .CWK files, as only the latest version supports the format. You should also check the .CWK file for viruses with a popular antivirus.
Apple iWork '09
LibreOffice
Panergy docXConverter