docs: def Run(self, unused_args):
      """Estimate the install date of this system."""
      # Don't use winreg.KEY_WOW64_64KEY since it breaks on Windows 2000
      subkey = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,
                              "Software\\Microsoft\\Windows NT\\CurrentVersion",
                              0, winreg.KEY_READ)
      install_date = winreg.QueryValueEx(subkey, "InstallDate")
      self.SendReply(rdfvalue.RDFDatetime.FromSecondsSinceEpoch(install_date[0]))