HELP NEEDED: Can anyone help me understand use on 3rd party DLLs #2623

Hi, I am trying to use this to extend the functionality of a closed source DLL for a program.
I have decompiled to see the namespaces etc, there are a lot of them, and lots of other DLL referenced!
I added the references but am struggling to import the namespaces which i checked are public.
The namespaces have "." in them a lot e.g. in "..dll" there will be namespaces "..", could this be an issue or is it something else?