The good news is that this module does something I need, I use it all the time, and I'm grateful that it exists. It seems like this garden could use some more tending, though. In particular, version 1.07 doesn't build on my vanilla linux box via the CPAN interface, so I need to search out 1.09 (which is listed as not ready for prime time on CPAN) and build by hand.
I've only used RTF::TEXT::Converter attempting to convert a Greek RTF to text and it simply does not do the job. Worse, it doesn't even handle Unicode characters (\uN), which do not pose any language detection or encoding problems.