OH HEY LOOK HAVE SOME COPYPASTA FOR JAP REGIONAL. Grab the Loli Character Creator first, then follow these instructions.
I'm going to post my own directions for getting this working, since Applocale is gay. Plus, in the long run, this will install Japanese languages on your system until you decide to remove them or format.
So here we go.
(This is assuming you have XP. Fuck you Vistafags. Get your own directions.)
a.) Download East Asian Language files from here. It's 100MB.
http://www.megaupload.com/?d=qui8jotwb.) Extract. Hurr.
c.) Click Start > Control Panel > Regional and Language Options. Go to the Languages tab and click on Install files for East Asian Languages. Should ask you to direct it to the i386 directory.
d.) Browse to the extracted East Asian Language files folder and double click. Let it copy files. It should be done after that. If not, do whatever the fuck it tells you.
e.) East Asian Language files support should now be installed onto your XP system. Reboot.
f.) Now go back to the first sentence of direction c.), but this time go to the Advanced tab. Switch the language for non-Unicode programs from English to Japanese. Reboot once more just to be sure.
There you go. You now have permanent East Asian shit on your computer. Enjoy. Also, fuck me, this is all from memory.