I'm not sure what you're asking.

Once you've the game installed the sound files can be found
under
Shogun_Total War/sounds/.
Shogun_Total War/voices/ and
Shogun_Total War/foices/
They are in .wav format. The voices are available in your language
and japanese (foices).
They can not be downloaded from anywhere.
Extracting them from the CD directly is not possible to my knowledge.