@arast - leaving the epub editing issue aside - I'm confused
Converting an EPUB to RTF won't change calibre author names, if you then edit the RTF with Word (where it is - i.e. in the book folder) and save it, then once again it won't alter the calibre author names. And if you convert the edited RTF back to EPUB that won't alter the calibre author names either.
The only time calibre will get the metadata from any format file is when a book is added, or if you use the get metadata from selected format feature in metadata edit.
BR
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