Comment 5 for bug 1176738

Presumably all your RTFs are generated by the same program, so they
will all show the same issue. RTF is an awful format, use HTML instead.
Or open your rtf in wordpad and save it, that might fix the problems in
it.

You can convert any html file that links to its pictures locally, the
pictures will be retained. If you dont have Word, get LibreOffice (its
free) and use that to convert your RTF to HTML instead.