I am using the win API AddAccessAllowedAce() to allow an ace to the WiNNT ACL of the NTFS system. The third parameter of the above API is the Access_Mask . Iwant to give the is folder permissions Read(RX)(RX). What should be the corresponding ACCESS_MASK for this. I can set the same permissions thru WINNT GUI. I want to do that programatically. Any help would be highly appreciated.