I need to store non-office files in Sharepoint, and I'd like to know how to define their Content Type. The main 'outside' file types will be pdfs, Sibelius files (notation software) and Photoshop .psd files. I want to create new content types for these to associate certain metadata with the files.
Should I create content types for these files inheriting from "Document" or "Unknown Document Type"? What implications does each option have?