Norton_360 Backup on external hard drive

When I view the contents on my external hard drive, I can't tell what is actually in the backup file.  There is just a bunch of weird file names but the folder is very large.  How do I tell what is backed up?  How would I extract these files in the event I lose my computer's internal hard drive?

When I view the contents on my external hard drive, I can't tell what is actually in the backup file.  There is just a bunch of weird file names but the folder is very large.  How do I tell what is backed up?  How would I extract these files in the event I lose my computer's internal hard drive?