传递VBA类的实时实例时，C＃ITypeInfo.GetContainingTypeLib失败

So I have experimented on calling ITypeInfo on a VBA Class instance and whilst it looks promising I wanted to see if I could get a reference to its containing project, an analogue to a type library. I thought ITypeInfo.GetContainingTypeLib might be useful but it throws an exception indicating VBA won't co-operate. Anyone got any ideas about how VBA maybe doing things differently from the standard COM specification?So I have experimented on calling ITypeInfo on