What assembly reference do I add to use System.Win32?

I'm trying to use objects within System.Win32.SystemEv开发者_如何学JAVAents, but I can't find the assembly to add to my C# project. There is no obvious dll anywhere...

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Don't you mean:

Microsoft.Win32.SystemEvents

You don't need to reference any additional assemblies for that.

Assembly: System (in System.dll). This assembly is already referenced.