Unfortunately, we still use COM to access a few of our own and 3rd party native libraries in our product from .NET code.

In my journey to improve our build system I needed to work out how to generate COM interop assemblies exactly like Visual Studio does when you add a reference to a type library.

Just run the Type Library Importer (tlbimp) like following substituting {0} with your library’s name. The key is the /namespace argument which defaults to Interop if not specified.

tlbimp.exe {0}.dll /strictref /namespace:{0} /out:Interop.{0}.dll