I'm an Windows 8.1 User in China mainland, and my system language is Simplified-Chinese.Formy business purpose, I also installed the Japanese languagein my system. In the "Language Preferences"options in Control Panel, I put "Simplified-Chinese" in the first, and the "Japanese" language is in the second position. But a lot of applications and websites always detemined that I'm using a Japanese language system, and show me their Japaneseversion.
A list of part of affected applications and websites: microsoft.com, live.com, Adera (App), XBOX (App), Soletaire Collection (App), ...
This problem occurs in the original version of Windows 8, and still alive in the Windows 8.1 Preview.