Mule & Thai

Folks, Someone where i work is interested in using XEmacs w/Mule to read Thai encoded files. I see that thai support was removed from XEmacs around January or so, apparently it was broken. I'd like to help him use XEmacs to read his Thai files, but I know little about coding systems, thai, etc, but I'm willing to try to hack a bit on it. I see Emacs 20.2 apparently has thai support, how close are their language/thai*.el files to our old ones? How hard is it to port them to what our mule expects? I can't find the old ones that were removed, to do any comparision. If anyone has them, could they send them, please? Jeff