File lock or folder lock

Is there any api i can use to lock files or folder, preventing them to be accessible from the user???

i tried to open the file without any sharing, it works alright, but it would be a little slow if i want to lock a folder with many many files in it...

I have a nice little way to lock folders for anybody that is unfamiliar with dos.


open up a dos prompt, and rename the folder.


C:\windows\desktop\dennis>rename yaknow _yaknow


but instead of using the normal underscore, use Alt + 255(on the keypad), it can only be changed in dos, like this

C:\windows\desktop\dennis>rename *yaknow yaknow

you can shell dos, and then close the dos window, I am not sure how to do this.
but you can also use API, I guess...