Is the Japanese Language Pack installed on your rig?
·Settings > Time & Language > Region & Language > Add Language (Profit?)
If not, then do so; and later, re-extract the game and run it in Jap locale (for instance, via a locale emulator; or however you want to do it). As it is an older game, you may need to run the game using one of the older compatibilities--XP, in this case.