GBK encode xml can't show correct when publish to standalone exe

I recieve GBK encode xml from a oracle database, then i extract the chinese part from it and use NGUI to show it in editor,it's ok.
but when i publish it to a standalone exe, the chinese part will show a mess (the english part is ok all the time).
I use Debug.Log() in script to show it, the exe log show this:

Unsupported encoding: 'GBK'

why?

 

Which mono dlls should i copy?

 

Thank you very much!
I try it.

 

Thanks to Graham Dunnett!

At last, i find the solution:
when run in editor, unity use the I18N.CJK.dll, which located in here (for example):
D:\Unity\Editor\Data\MonoBleedingEdge\lib\mono\unity\I18N.CJK.dll
so this line: byte[] gbkBytes = Encoding.GetEncoding("gb2312").GetBytes("中文"); will be ok!
But when publish to standalone, the I18N.CJK.dll is not include in exe, so it will fail.

The solution :
Copy I18N.CJK.dll in to Assets\Plugins, the publish to standalone exe, it works!


Reference:
http://answers.unity3d.com/questions/42955/codepage-1252-not-supported-works-in-editor-but-no.html

 

Thank you very much!
it works!