Is might know from some of the other WPF related articles, I have been working on getting to know XAML and WPF a little better. So far, it has been one bug and disappointment after another. The newest issue is that Visual Studio Team System 2008 is not able to create a .vshost.exe file (an internal version of your application for usage inside of the Visual Studio IDE).

Here's the error message you'll get:

Visual Studio could not copy a support file to this location: 'C:\Documents and Settings\UserName\My Documents\Visual Studio 2008\Projects\SokutionName\ProjectName\bin\Debug\ExecutableName.vshost.exe'. Please verify the path exists and is writable.

This usually occurs after messing up a bit of code while rewriting my XAML. I tend to do a rebuild to see if the edits work. The only solution is to quit Visual Studio 2008 and then open it again; this will allow you to rebuild/debug the application further.