From publisher blurb: AutoHARP SF Xtreme is an add-on database (drawing upon the HARP SF Xtreme supplement) for the AutoHARP SF software. The database file includes Vehicle Combat, Vehicles in general added to the items, Cyberware, Interstellar Travel, a Virtual Character converter and the ability to create an AI or Robotic character, providing you with the full suite of options available in HARP SF & HARP SF Xtreme The software works under Windows and most Linux distributions. Use the exe file for Windows and the jar files for Windows or Linux - note the jar files require the Java Runtime Environment.