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MontyJ - I think this should have been be posted in the Microsoft Doc Input Plugin thread ==>>
https://www.mobileread.com/forums/sho...d.php?t=229166 AFAIK that is the only place where wordconv.exe is made use of.
That said, IMO you'd be better off converting the DOC's to DOCX's outside of calibre via wordconv.exe, perhaps using a batch file. Then add the DOCX files to calibre and convert them to EPUB & MOBI.
BR