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

@@ -333,10 +333,13 @@
         // 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);
     }
 }
 
 //