src/java.desktop/windows/native/libawt/windows/awt_Robot.cpp

*** 333,342 ****
--- 333,345 ----
          // no equivalent Windows key found for given Java keycode
          JNU_ThrowIllegalArgumentException(env, "Invalid key code");
      } else {
          // get the scancode from the virtual key
          scancode = ::MapVirtualKey(vkey, 0);
+         if (vkey == VK_RMENU) {
+             dwFlags |= KEYEVENTF_EXTENDEDKEY;
+         }
          keybd_event(vkey, scancode, dwFlags, 0);
      }
  }
  
  //