[4691mls]

I don't know if this is just a Sony thing or if it's the same for all epub readers/software. If it turns out to be just Sony, moderators please move to appropriate forum.

Until recently I hadn't had a reason to look in the folder on my PC (Windows 7) where epub files were stored. I have now discovered that when I return an Overdrive library epub using the Sony software, the book disappears from the Sony program but the actual epub file is not deleted from the computer. These epubs are still in a folder on my PC, mixed in with my purchased books which are still active and viewable in the Sony software.

In the future I will plan to delete each library book's file once I've returned the book. However, for now I have a LOT of these returned/expired epub files and I would like to get rid of them.

The only way I know to determine if a file in the PC's epubs folder is a returned/expired library book is to go into the folder and try to open an epub file. If it's a returned book, I get an error message. If it's an active book, it opens in the Sony software. Unfortunately, it would be quite time-consuming to do this for each individual book as there are a few hundred files in this folder!

Does anyone know a way to determine if an epub file on the PC is an expired file without actually trying to open it?