NSIS_2.46_******odernUI_1.00_2009-12-25 can not support SimpChinese?

I'm using NSIS_2.46_******odernUI_1.00_2009-12-25 to make a installer.
I found in Welcome page and Finish page, the chinese can not be displayed? I do not know why?

In example WelcomeFinishAbort.nsi, I changed the line " !insertmacro MUI_LANGUAGE English" to
" !insertmacro MUI_LANGUAGE "SimpChinese"", but at the Welcome page, do not display any welcome text, just blank. But License, component, install page is ok.
Likely I found Only new page added by the ******odernUI don't work with chinese.
Then, I changed to "Japanese", it don't work too.
But "Danish","German".... is ok.
I doubt if the Orient Language have some questions?

I have spent servral days to figure out, but still can not resolve it.

who can help me?

thanks

You should use the Unicode version of NSIS:

Thanks for your advice.
I will try the Unicode version.

But I want to why.
Because the former version can support chinese. I think some thing wrong with the modernUI, I want to figure out.

I have found the function("Function ${UNINSTALLER_FUNCPREFIX}Nsis2Io"), dealt with STRING by CHAR.
Is the function cause the questions?