MASM32 Downloads
There is some related information here:http://www.mvps.org/user32/gditutorial.htmlBut in the short time I had to experiment with it, I could not make it work.
hSysMenu = GetSystemMenu( hWnd, FALSE ); AppendMenu( hSysMenu, MF_SEPARATOR, 0, 0 );
INVOKE GetSystemMenu,hWnd,FALSE mov hSysMenu,eax INVOKE AppendMenu,hSysMenu,MF_SEPARATOR, 0, 0