Prevent executables from running on mapped network drives

Hi! In our company, we are using Windows 7 and my goal is to prevent users (also administrators) of specific workstations from running executables which are located on mapped network drives (servers). I tried different things (e.g. Software Restriction Policies or Applocker => in both cases I tried the UNC address as well as the drive letter to set up the rules) but nothing worked. I...