Dog-he said-gone! That was it. I just saved one of them as an .rtf and it converted just fine. I'm a relative newbie to Calibre (and fast becoming a devotee of St. Kovid...) and I've downloaded a lot of files with a .doc extension that haven't given me any trouble. So they must have been .rtfs masquerading as .docs. That lead me to believe that .docs worked just fine.
Thanks to both of you for the pointer.
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