If the rtf converter that we include with greenstone can't handle
your rtf files, then changing process_exp options won't help much.

The .doc converter (wvWare) only handles "real" Word documents,
and not .rtf documents. Our conversion process will detect if a word
document is really .rtf and will use the rtf converter instead.

Maybe you could find a program to automatically convert the Czech
.rtf files into another format (such as text, html, or proper .doc)
that the greenstone plugins can use.

Hope this helps
John McPherson