We use file extension to detect the file type. For example, the file with a .doc file extentsion means it is a Microsoft Word Document, and the File Extension CWK means it is a ClarisWorks document.
Sometimes you may find it is not so easy, many documents use the same file extension. This website is about File Extension CWK , but I really not sure about its usage. I think you can get help from this site.
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