The file or folder “…” is not a valid Blend project.
I got this error message when I tried to open a XAML file created using a VS 2008 WPF project in Expression Blend 3. My OS is Windows 7.
So, to resolve the issue, I opened the Expression Blend 3 application and browsed to the solution (not the project) of my WPF application. Now, I was able to open the WPF application solution using Expression Blend and edit my XAML files.
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