create a program to block access to a folder

[DeMenAce]

I'd like to create a program in C + + to be asked a code to open a folder
I have the program: dev-cpp
thank you for helping me

[SecRecy]

May I know why to create one, you can finds many programs for that and free as well?

Example: AxCrypt

[DeMenAce]

I know that we can use special programs
but I have a USB key that has an intelligent encryption program and integrate the code is running on any computer without the need to install a program.
So thank you to those who could give me a code in C + +
thank you