Try this one if you are certain that you didn’t put a password though I believe you have put password to make sure no one can access which you may have forgotten of. Nevertheless, before opening with it notepad, make sure you have copied the Bitcoin file and stored it somewhere safely in another device.
By any chance, is it possible that anyone else had access to your Laptop? Besides, if you have the address you filled BTC with, you can check it through explorer & be sure that your wallet haven’t been compromised already. Good luck.