I have a lot of old .wps files which I'd like to open.

Word 2007 reports that some are corrupt but doesn't attempt to recover them.

I know some have some defunct Greek polytonic fonts and maybe that is a problem..

any ideas how I might recover/open these files?

Were they all produced by the same version of Works? Recent Word versions will only open Works versions 6 to 9. For earlier versions you need the older filters, linked from the downloads page of my web site. If a font is not available Windows will replace the font with a usable, albeit probably inappropriate, font.

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Graham Mayor - MS MVP (Word) (2002-2019)
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