On my Windows 7 computer I downloaded and installed 2.1.1474.0-x64. I encrypted a text file and then quit Axcrypt. I double-clicked on the encrypted file and the password screen opened. I entered my password and the file opened in my text editor. I closed the file. When I opened it again it opened without requiring the entry of a password.
Exactly, it’s intended to work that way! It’s a feature to make it easier to work with encrypted files, and make it easier to use really good and strong passwords – without endangering security, provided you are following a good security practice in the first place and never leave your computer logged in to Windows in a hostile environment.
In my opinion, this is a less secure system, because even when one follows best network security practices there is always the possibility of a hacker getting in. Even multi-million dollar companies and government agencies are hacked. I would suggest that you consider adding an option to the program: “Require password entry at each launch of encrypted files”.