Check if unmanaged DLL is 32-bit or 64-bit?

Question

How can I programmatically tell in C# if an unmanaged DLL file is x86 or x64?

Answer 1

Using a Visual Studio command prompt, dumpbin /headers dllname.dll works too. On my machine the beginning of the output stated:

FILE HEADER VALUES
8664 machine (x64)
5 number of sections
47591774 time date stamp Fri Dec 07 03:50:44 2007