Anson,
You haven't mentioned XPe version you use (SP1?).
I have only seen these MUI packs available to OEMs who use XPe without SP1:
French
German
Japanese
Korean
Simplified Chinese
Traditional Chinese
And for XPe with SP1:
Arabic
Czech
Danish
Dutch
Finnish
French
German
Greek
Hebrew
Hungarian
Italian
Japanese
Korean
Norwegian
Polish
Portuguese
Russian
Simplified Chinese
Spanish
Swedish
Traditional Chinese
Turkish
Sorry, seems like no Thai MUI support in XPe.
Don't know why it has not yet been componentized. XP Pro LIP seems to have a
support for Thai language.
KM,
BSquare Corp.