new_contents: """
  Need to change all GUIDs for your every new plugin, is daunting, so let's
  generate them from strings that are unique for plugins.
  
  
  Low-level Far Manager API is here:
  
   * https://api.farmanager.com/en/exported_functions/getglobalinfow.html
    
  """
  
  # --- utility functions ---
  
  import hashlib
  
  def getuuid(data):
      """Generate UUID from `data` string"""
      if type(data) != bytes:
          data = data.encode('utf-8')
      h = hashlib.sha256(data).hexdigest()[:32].upper()
      for i, pos in enumerate([8, 12, 16, 20]):
          h = h[:i+pos] + '-' + h[i+pos:]
      return h
  
  
  # --- plugin interface
  
  def GetGlobalInfoW(info):
      """ Called by Far Manager, plugin needs to fill the info """
      info["Title"] = "____"                             # should be set and non-empty
      info["Author"] = "_"                               # should be set and non-empty
      info["Description"] = "Simple Python plugin"       # should be set
      info["Guid"] = getuuid(info["Title"])
  
  def GetPluginInfoW(info):
      info["MenuString"] = "01autoguid"
      info["Guid"] = getuuid(info["MenuString"])
  
  def OpenW(info):
      print("[open] " + __file__)
  
subject: Add 01autoguid/ plugin with own GUIDs autogenerated