They finally caved in and went to ebay for some old machines to install Quark on.
However as I read http://livedocs.adobe.com/en_US/InDesign/5.0/help.html?content=WSa285fff53dea4f8617383751001ea8cb3f-6d47.html it appears the new apps from Adobe can open these.
Bob
What program can I use to open old Quark XPress documents? These were all created in Quark 4 and 5 - now that my old Macs with OS 9 have finally given up the ghost, I'm kind of stuck! I need something (much) less expensive than a new version of Quark.

Chowhound
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