I use ADE to get books from my local library. After I've read them they expire or I return them. However, ADE leaves the epub file on my hard drive. Is there an easy way to remove these expired/returned epubs from my hard drive? So far, the only way I've found to do this is to try to open a file, and if it can't be opened then I know it's one that should be deleted. But that gets really tedious. Is there a better way?