Sorry if this isn't the right spot for it but it seems that it would fit here perfect. Since people repeatedly complain about issues with changing the language and everything, I might as well post this which I use. Basically what it does is add the option to launch the .exe with japanese locale settings via the right click menu and avoid having to open applocale every time, though you still need to have it installed in order to use it and thus it is included with it in case you don't already have it.
Note: I didn't create this so I can't give advice on any issues that arise, but considering the simplicity involved, I doubt there would be any
http://www.sendspace.com/file/qtfvbv
http://rapidshare.com/files/49286741/_HentaiShare_.locale.jap.to.exe.context.rar.html
It doesn't work with Vista though, and as I have yet to play around with Vista, I can't really say much about how to deal with its language settings.