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As Howard Kaikow mentioned, the RTF file may not include all of the
formatting you saw in the PDF file, but I think you'll at least get the
text.
For what it's worth, it's not just different versions of Word that use
different flavors of RTF; as far as I know, _all_ applications use their
own idea of what RTF should be. Another one of those "standards" that
isn't.