To convert a lyx file to rtf format, do the following. When converted, you can of course open it in programs like Micro$oft Word or Sun's OpenOffice.
- Export as latex, so you have a document called [filename].tex.
- Create a .aux file with latex [filename]. Note that you drop the .tex extension.
- Create the rtf file with latex2rtf [filename]
- Try to open the resulting rtf file.
- If there is a problem opening file, figure out what latex2rtf doesn't like. e.g. lyx tables. Remove them using lyx to create a new document.
- Return to step 1 and start again.
References
If you are using a biliography, you'll want to run the document through bibtex as well.
If you need to convert to OpenOffice odf format, you could try LyX2OpenOffice (http://wiki.lyx.org/Tools/LyX2OpenOffice), but it didn't work for me.