Desktop Extension - Java System Tray for Windows - Version 1.0.0 Desktop Extension (DesktopEx) is a platform independent framework that extends Java GUI application developers reach into desktop user interface. System Tray of DesktopEx helps you add System Tray Icons to your GUI applications. You no longer need to write native code using Java Native Interface. DesktopEx takes care of native coding for you so that you can focus on building Java applications.