Empathy is a special utility allowing you to password-protect any executable file. Empathy can modify an EXE file so that it will require a password to run. Only a person knowing the password will be allowed to run the protected program.
Protected files stay protected if you copy them to another location or even to another computer, no matter which operating system do they use.
Empathy allows you to protect potentially dangerous programs against running by an unauthorized person. You can use it to protect executable files in public places like schools, internet coffees or even homes.