All files in .locker folders are encrypted. When you open a .locker folder via the NordLocker application, the encrypted files will have their original names and will be displayed clearly. 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 locker container (folders) has the NordLocker icon, not the encrypted files.
If you have any questions, do not hesitate to contact our Customer Success team.