We have an encryption method that prevents anyone from getting access to the information in your mSpy account.
Your personal key file is the special file you have to store in the safe place in case you forget the password to your mSpy account. You should not open or modify it because it becomes invalid.
You can always download the current key file from the Device Management tab in your mSpy account.
You may find this video guide on how to reset a password with the key file useful.
If you reset the password without the key file all the information that has been stored in your mSpy account prior to the password reset will become encrypted. There will be no way to restore it!