I'm Japanese, sorry for my baaad English.¶

What went wrong?

Put Dolphin user directory in the path contains the folder double byte/diacritical mark named, some problems appeared.
e.g.
C:\Users\あいうえお\My Documents\Dolphin Emulator.
C:\Users\一二三四五六七八九十\My Documents\Dolphin Emulator.
C:\Users\François\My Documents\Dolphin Emulator.

1. Can't create Wii saves.
   Run Wii games have no save data yet, game show a message like "Could not write to/read from wii system memory."
   Some games shows "Save successful." and created wii/title/<GAMEID>/ folder but doesn't created any files in<GAMEID>folder.

2. Crash when using "Open Wii save folder" or "Open containg folder" feature.
   When trying to these features, you get this message then Dolphin crash.
   http://imageshack.us/photo/my-images/546/e8ur.png/

This problem already appeared at Dolphin 3.5-547 but recently got many reports in my country forum.
I think Dolphin 4.0 has global user directory system but many people using user account name with "native" language.
So this problem became obvious all at once.

Which versions of Dolphin did you test on?
Dolphin 4.0 - Broken
Dolphin 3.5-547 - Broken
Dolphin 3.5-518 - Works
Dolphin 3.5 - Works

What are your PC specifications (example: Operating System, CPU and GPU)?
Win7 Pro 64bit

64 or 32 bit Dolphin?
Both