Konnichiwa,

You could use these bat files to set it up and swap:
The Latin folder is used (IIRC), so you have to swap if you want MTW sound in normal MTW games.

An install of STW WE/MI is required to grab the music files:

http://www.totalwar.org/tosa/STW_Mod_Sound.zip

Choice.com is required to run bat in XP and 2000 (?)

http://www.totalwar.org/tosa/WinXP-Bat.zip

It has a brief readme, don't hesitate to ask for more details.