Crash when starting Wings 3D 1.5.1

[Letschki]

Hello,

when starting Wings 3D 1.5.1 (64-Bit) i get the attached crash dump file.

I am using Windows 8.1 Pro (64-Bit) - German. I think the problem is related to the german name (with Umlaut: ö) that is used as user profile name ('Jörg').

Reason: {function_clause,
[{filename,join,
[{error,"C:\\Users\\J",<<"örg\\AppData\\Roaming">>},
"Wings3D/Preferences.txt"],
[{file,"filename.erl"},{line,406}]},
{wings_pref,try_location,2,[{file,"wings_pref.erl"},{line,276}]},
{wings_pref,win32_pref,0,[{file,"wings_pref.erl"},{line,205}]},
{wings_pref,load,0,[{file,"wings_pref.erl"},{line,41}]},
{wings,init,1,[{file,"wings.erl"},{line,100}]}]}

Wings 1.4.1 runs without any problems.

OS:
Windows 8.1 Pro (64-Bit) - German
CPU:
Intel Core i7-2600K
GPU:
NVIDIA GForce GTX 580 (Driver Version 331.65)
Intel HD Graphics 3000

I hope the provided information help to find the problem or to point me to my problem.