Menu newlook option

I am trying to skin menus.  They always appear with a separator bar between the icon and text which I would like to eliminate.  The help file contains:
 

 If the menu has icons, and the newlook option is set non-zero with exec.menuoptions, then the Windows 7 menu format will be used (eg line separating icon from text).  This option is on by default for Windows Vista and later.  Use 

exec.menuoptions 

newlook n 

to check it (where n is 0 or 1).

 

 So I presumably need to invoke "exec.menuoptions" and set newlook to 0.  How exactly is this done?  The function doesn't seem to be related to contents of a skin file, or *Exec, and there is no other reference to it in the help system.