I use window 7 with 32-bit operating system. When I open the Windows Media Player and add the songs to the playlist, my windows media player can not display Thai languages.
To fix that you should install the thai language pack. Its somewhere on your windows CD/DVD. You could also download vlc player. It's pretty much the best free mdia player that is available for windows. Had it for over 5 months and it has never crashed since that date. You can also choose thai as an installation language and all your songs names will show up.