Hi. I've been working on this for a while. I think now it's good enough to post it here. Functions to do most everything with the DACL and ownership on all types of objects: Files or folders, Registry keys, services, Kernel and WMI objects, etc. Here's a good example to test: #include 'Permissions.au3' _InitiatePermissionResources() FileWrite(@ScriptDir&'test.txt','Test') Local $TI = TimerInit() Local $ret = _DenyAllAccess(@ScriptDir&'test.txt',$SE_FILE_OBJECT,@UserName) Loc