I made Japanese version of ReactOS.
Following is all that I have done.
1) add jpn.nls to \lib\kernel32\nls\
2) modify \lib\kernel32\locale_rc.rc
3) add Japanese font to \media\fonts\
4) add next line to \bootdata\hivesft.inf
HKLM,"SOFTWARE\Microsoft\Windows NT\CurrentVersion\SysFontSubstitutes","MS
UI Gothic",0x0000
0000,"FontName"
5) add next line to \bootdata\packages\reactos.dff
media\fonts\FontName.ttf 3
6) modify locale settings at \bootdata\hivesft.inf and hivesys.inf
HKCU,"Control
Panel\International","Locale",0x00000000,"0411"
HKLM,"SYSTEM\CurrentControlSet\Control\NLS\Language","Default",0x00000000,"0411"
HKLM,"SYSTEM\CurrentControlSet\Control\NLS\Language","InstallLanguage",0x00000000,"0411"
Now please look at these screenshots.
http://reactos-j.sourceforge.jp/up/img/081.png
http://reactos-j.sourceforge.jp/up/img/082.png
The former uses mona
http://monafont.sourceforge.net/index-e.html
The latter uses mplus
http://www.kaoriya.net/#BDFM+
I'm very sad...
Is ReactOS able to handle Japanese font properly?