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Editorial Team
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Asked: 2026-05-20T08:34:45+00:00

I have a COM Interop DLL that I’m automatically generating from an existing COM

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I have a COM Interop DLL that I’m automatically generating from an existing COM DLL, using tlbimp. What I need is to add Details to the DLL’s Properties dialog for file version, copyright info, etc.

I found some sample code that uses the AssemblyBuilder.SetCustomAttribute() API to dynamically set AssemblyCopyrightAttribute, etc.

However, the AssemblyBuilder instance in use comes from AppDomain.CurrentDomain.DefineDynamicAssembly(), which appears to only create new assemblies. (Indeed, whenever I try that code with my DLL name, it deletes my DLL and creates a new one.)

Is there any way to get an instance of AssemblyBuilder for an existing assembly?

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1 Answer

  1. Editorial Team

    No, you’re fundamentally looking for the wrong solution. What you see in explorer’s Details tab is actually an unmanaged resource. The C# compiler auto-generates one from the assembly attributes (/win32res compiler option), this of course does not happen when you create an interop assembly. Or for that matter try to create one with an AssemblyBuilder.

    To make this work, you first have to disassemble the interop library with ildasm.exe /out. Next, you have to create a version resource, best done with a C++ project. Use the resource editor to add a Version resource. After building you get a .res file. Then use ilasm.exe to re-create the interop library, using the /resource option to get the .res file embedded.

    I gave you the 100 miles per hour version, this is hard to automate.

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