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ICommand is currently implemented in System.dll in mono's .net 4.0 libraries. However, in MS.NET 4.0, this is defined in PresentationCore.dll instead.
We currently compile some WPF related code using mono and reference a copy of the PresentationCore.dll from windows, however with this interface defined in System.dll, it causes the compile to fail as it is defined multiple times.
This should be removed from System.dll (or moved to PresentationCore.dll) for .net 4.0.