I don't have an Apple Works document to test it on, but I have read that right (control)-clicking on one gives you a choice of "Pages" to open it. Not sure what version of Pages or what OS version that may have worked on. OTOH, it's an easy try... assuming you have some version of Pages, preferably an older one.
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TextWrangler> can probably open them and you might then be able to delete everything except the text. Xcode (free from Apple) should open it, also, but it might be more more difficult just to get a display that might have the text!
Update: Just read that one person reports that LibreOffice can perform this trick.
I think LibreOfiice has ceased development, however. And, again, I don't know which version might have been used.
Have you searched the web for on-line conversion sites? Seem to be hundreds, of all types! I'm looking for one that will convert dollar bills to twenties...
LibreOffice is still being developed, I recently dl'd version 5.