When launching

dscom tlbexport my.dll --asmpath D:\mypath

I found an unhandled exception with Visual Visual Studio:

Exception thrown at 0x00007FFB7531831A in dscom.exe: Microsoft C++ exception: HRMsgException at memory location 0x00000000001C7380.

at the function LoadFromAssemblyPath(dllToLoad)

and the issue is that not all types are loaded.

By replacing LoadFromAssemblyPath() with

Assembly.LoadFile(dllToLoad)

the assembly and all dependencies are correctly loaded.

Additional details:

my.dll is defining a COM interface and a class derived from MyLib.MyClass that is a class in another assembly that actually implement the interface

    [ComVisible(true)]
    [InterfaceType(ComInterfaceType.InterfaceIsDual)]
    [Guid("AA3C9EF2-AAAA-424B-8A96-35910B102956")]
    public interface ISum
    {
        int Sum(int a, int b);
    }

    [ComVisible(true)]
    [ClassInterface(ClassInterfaceType.None)]
    [Guid("AAAB3576-AAAA-4652-A87A-3579DD85AF69")]
    public class ComSum : MyLib.MyClass, ISum
    {
        
    }