IT: Locking the folder using password

I received a call from a colleague yesterday asking for help!
She need to lock the folder which contains P&C files.
I then told her..according to my understanding, there is no way!
As i know, you must use 3rd party software

This morning, I was looking into this and i found an interesting movie on this
Title: To Lock Folder Without Any Software
Check this out!


Lock Folder Without Any Software