Intellisense not working via COM

I recently needed to write a class in C# that would be accessed by a VB6 application – something quite new to me.

The existing VB6 application (which is in the process of being rewritten in C#) currently uses OLE Automation to generate MSWord documents based on templates. While this approach was working fine it was pretty slow. Having made the decision that the new version of the application would be capable of generating Word 2007 documents it was decided that the resulting class should be accessible to the VB6 application via COM Interop.
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