Create Custom properties: "File could not be created"

Hello everyone,

we recently migrated to SolidWorks GERMAN 2011 on a Windows7 x64 machine and have some issues with "Benutzerdefinierte Eigenschaften". After manually adding a custom property and accepting it with "Add -> OK", we get a strange looking dialog, which names an incorrect path:

Do you have any ideas, how to fix the path?

SolidworksConfigurations design Tables