How can I tell which of my files are encrypted?

All files in .locker folders are encrypted. When you open a .locker folder via NordLocker, the encrypted files will have their original names. If you or someone else tries to open a .locker folder without the app and without your Master Password, the names of encrypted files will be displayed as gibberish text. Note, that only the container (folders) has the icon, not the encrypted files.