VB6 Loading .net 4 C# COM dll from Windows 7 to Windows XP

Question

I have a C# ComVisible Class Library dll created on .Net Framework 4.5 environment - but the dll target framework is set to Framework 3.5 I have created the COM dll and added it to a GAC using Visual Studio 2012 I add this dll as a reference in my legacy VB6 project ( from Project->Add Reference). Everything works fine. All this is done in Windows 7.

Now, I use the same dll on Windows XP which has .net Framework 4.0. I add the dll into the GAC on Windows XP. But I am unable to locate the dll in VB to add it as reference. Could you please tell me what I might be missing. In my XP machine, the dll is present in: C:\\WINDOWS\\assembly\\GAC_MSIL location

Any idea what I am missing here, please ?

EDIT: I have also registered the assembly with regasm utility. Any changes in the registry I should do to see my COM dll in 'available reference' list in my VB6 project??

Answer 1

When registering your assembly for COM you need to call

regasm myassembly.dll /codebase

The /codebase adds the relevant Registry entries that you VB6 application will use to find the DLL.