Thanks Ralph. I'm after a list of all the files associated with a project. When you look at Drawing Manager you get it. This is all external content - so far I've found that the ones I'm looking for are in Drawing objects, so I'm progressing with the other topic on accessing all objects from all databases. It seems if I iterate through all the databases and all the drawing objects of them, then I can compile a list of the external content.
Originally I thought these were hotlinks but, at least in files I'm working with, they are drawing objects.