Zip files

I posted this suggestion/feature request in the Technical Support forum, but thought it might a good idea to include it here too:

To help guard against any risk of confusion when working with backup files, and a user might have two or more copies/versions of a project open at the same time, it might also be a good idea to make the Scrivener window or its chrome a different colour, or to enable some kind of overlay, when the “open backup” feature is invoked.