Set folder permissions to read only to all users without using batch file

Hi,

I want to set folder permission to read only access to all users using TestComplete. I am writing some code in JScript but its not working and I am still able to copy files/install exe to that folder.

My code:

function test()
{

aqFileSystem.ChangeAttributes("C:\\WorkingFolder", aqFileSystem.faReadOnly, aqFileSystem.fattrSet);

}

I want to accomplish this without using batch file. Anyone having solution to this?