Used main functions: _GUICtrlMenu_GetSystemMenu _GUICtrlMenu_InsertMenu _GUICtrlMenu_AppendMenu #include <GuiMenu.au3> #include <GuiConstantsEx.au3> #include <WindowsConstants.au3> Global $hGUI, $hSysMenu, $iCount Global Enum $idOptions = 1000, $idAbout $hGUI = GUICreate("System Menu", 400, 300) $hSysMenu = _GUICtrlMenu_GetSystemMenu($hGUI) $iCount = _GUICtrlMenu_GetItemCount($hSysMenu) ; insert items before end _GUICtrlMenu_InsertMenu ($hSysMenu, $iCount - 1, BitOr($