I created a Solution in Visual Studio 2013 and in that solution, I added an existing open source project and then added my own project to reference the methods in the open source one.
More specifically, the open source project writes and merges PDF files.
But, since I need that functionality in MS Access VBA, I could not compile that PDF project, directly.
So, I added a second project as a wrapper, which simply calls the needed methods from the other project.
I then compiled the solution as a COM and selected Make Assembly Com visible.
I was then able to create a Reference in MS Access VBA module and run that code.
BUT, when I tried to install my Access file and DLLs from the VS Solution on a Production computer, it didn't work. Apparently, the DLLs need to be registered, which happens automatically on the Dev machine.
From my Googling, it appears I need to run Regasm.exe.
I've attached to screenshots. One is a directory listing of the Build output from Visual Studio. The other is of the various attempts at running regasm and the resulting errors.