The type 'System.Windows.Input.ICommand' exists in both 'PresentationCore.dll' and 'System.dll?

The message is accurate, ICommand indeed exists in both assemblies for . NET 4.5. The problem is your reference to System. Dll, your project is using the wrong one.

The assemblies in the Microsoft.NET directory are no longer suitable to act as reference assemblies, like they were in versions of . NET prior to . NET 4.0.

They should no longer be there but unfortunately are required to get C++/CLI projects built.

The unit type exists in two dll files, it suggests that you are referencing two assemblies with the same type, so you would need to give the type you want to use the fully quantified name.

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