permissions

Hi
I have been running wordpress Mu for a while now and i havent had a security problem with it but i was searching all the time about the right permissions to be set on the different folders on my installation. all i find is how to set the permissions on a linux box with the chmod command sooo…. what about the permissions on a windows server machine. i have 5 users on each folder with different permission and they are administrators, IIS_WPG, users, internet guest acount IUSR and system.
regards