Background: The new style of document link beginning with x-scrivener-item invokes a protocol and includes a file path, and thus can open a Scrivener document directly (via its own project) from a command line, or an outside program, or another Scriv project, or a browser link.
Bug?: These links work properly from the primary Bookmarks inspector, but don’t seem to work from the Bookmarks pane in a Quick Reference window, whether invoked by double click or context menu.
Rgds - Jerome