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rebl - you probably don't need this PI if you can convert your .doc files to .docx
Using these tools ==>>
Bulk Convert DOC to DOCX I converted about 27,000 .doc files last year to .docx in a few hours. I did it shortly after Kovid implemented built in DOCX Input module.
I then used calibre to convert the .docx files to EPUB. By and large the resulting EPUBS were far better than any I ever got from .RTF, Filtered HTML or .DOC via this PI - by better I mean a less 'crud' and far easier to read HTML.
BR