C#: finding path to PresentationCore.dll (and other assemblies) in the GAC

I need to reference various assemblies in a CSharpCodeProvider via calling ReferencedAssemblies.Add.

For some assemblies, it is sufficient to simply pass the assembly name - for example ReferencedAssemblies.Add("System.dll").

However, PresentationCore.dll is one of those where a full path to the assembly is required - which I may not necessarily know on the target machine.

Question:

How can I locate the definitive path to the (latest?) respective assembly - say, in the GAC?

Ideally, the solution would not only work for PresentationCore.dll, but also other assemblies such as PresentationFramework.dll, System.Xaml.dll or System.Windows.Forms.

Sources that didn't yield the intended results:

• This solution would involve hard-coding a specific path, but the solution should be dynamic
• Implementing this Windows API may work; but I don't know how - or if it would even help solve the above
• This C++ question refers to where the GAC is found, but not how to get an actual file path