The latest version of Snoop on CodePlex supports up to .NET 4 and x64. It works outside of VS, so it doesn't matter which version you use, and in fact you don't need VS at all. You can just run it in almost any WPF application. I tried Mole several times, but never hit it, because Snoop is much better, especially if you are doing MVVM and cannot easily break into the debugger with the appropriate area to see the user interface.
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