Recently some people reported me that my Enigma cipher machine simulator works fine in Windows Vista but the Help file no longer opens in Vista. A new version 6.4 of the Enigma sim is now available with a help file in pdf format that can be called from the Sim Menu. This new pdf manual contains clear pictures that will guide you through the setting of the simulator and more new information. If you want to install the new version, please uninstall the old version first through settings/configurations screen/add-remove software. The Enigma simulator can be downloaded on this page.