What are all these Bdsk-File-* and Bdsk-Url-* fields that appear in my bibtex file?
BibDesk uses the Bdsk-File-* and Bdsk-Url-*fields to save location information for linked files and linked URLs, respectively. These are the linked files and URLs that appear as icons on the right-hand side pane of the main window and the detail window. Files are now stored using Mac OS aliases, so you can move them in the Finder without breaking BibDesk’s links.