I was wondering if it's possible to add non-book files to the Calibre Library using the "Add a format to this book" button in the Edit Metadata Screen. Basically I'd like to add the MyClippings, .mpb, and/or any artwork files I've created that are associated with each book.
My main concern is that I might mess up the way Calibre reads the library if these "foreign" files are suddenly added. I could save them elsewhere, but it'd be more convenient to have all of a book's files in one place.