That is why I programmed a small Python script which converts all the. cwk documents on your Mac to PDFīut it is very inconvenient to do this by hand for all the old documents on your Mac. Luckily you can open any old AppleWorks and ClarisWorks file with LibreOffice. cwk files on your new Mac? AppleWorks will surely not work, because it requires a PPC Mac or Rosetta Code, which doesn’t ship anymore for ages. How to open old AppleWorks and ClarisWorks documents? Luckily, there is still a way to open these documents. Those documents were made in 1997 with ClarisWorks (ClarisWorks is de predecessor of AppleWorks) and can’t be opened with any version of Pages (not even the oldest iWork version that runs on Intel Macs). Recently someone asked me if I could help him open old documents on his Mac.