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The iWork applications - Keynote, Pages & Numbers - can only open AppleWorks 6 presentation, word processing & spreadsheet documents, respectively. They will not open any other type of AppleWorks 6 files or any AppleWorks 5 or any version of ClarisWorks files.
The third-party application, EasyDraw, can open AppleWorks draw documents. There is nothing other than AppleWorks that can open paint or database documents.