Thank you. Since I don't have Visual C# .NET, only Visual Basic .NET, even in Express Edition, I decided to translate the file(s) in an XML-Editor.
I hope this works as will since I leave the schama untouched.
I did this at the fresh morning. I hope it works, please let me know if there are problems while compiling since my editor removed the UTF-8-Header from the XML-File (I mean the binary one, not the XML one).
Perhaps opening in the IDE will fix this problem automalicy.