As The Raven said, rather than saving in the default Docx format, select doc, this saves the file in the same format as Word 2000, XP and 2003. So you should be able to open the file in most recent versions of Word Perfect.
Thanks to everyone. I sent three tests to my sister in law who has Word Perfect. I saved them in different formats, including RTF and I'll let you know if one of the three worked and if she could open, read and edit what I sent her in that format.
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