If you want to hide your important secret files and folders so as to send them to somebody confidentially, then one way is to wrap them in an .exe container locker with a password. The recipient will have to unlock them with the help of the password to access the files contained within the EXE container.
Protect Me! 2010 creates secure executable (.exe) container files to which you can add any files and directories you want to! Your files will be stored securely inside the container file.
To ensure a maximum of security, Protect Me! 2010 uses SHA1 for password validation and AES for encryption.
This is a freeware utility and works on all presently used versions of Windows.