code: def create_file_dialog(dialog_type=OPEN_DIALOG, directory='', allow_multiple=False, save_filename='', file_types=()):
      
      if type(file_types) != tuple and type(file_types) != list:
          raise TypeError('file_types must be a tuple of strings')
      for f in file_types:
          parse_file_type(f)
  
      if not os.path.exists(directory):
          directory = ''
  
      return gui.create_file_dialog(dialog_type, directory, allow_multiple, save_filename, file_types)
docs: Create a file dialog
      :param dialog_type: Dialog type: open file (OPEN_DIALOG), save file (SAVE_DIALOG), open folder (OPEN_FOLDER). Default
                          is open file.
      :param directory: Initial directory
      :param allow_multiple: Allow multiple selection. Default is false.
      :param save_filename: Default filename for save file dialog.
      :param file_types: Allowed file types in open file dialog. Should be a tuple of strings in the format:
          filetypes = ('Description (*.extension[;*.extension[;...]])', ...)
      :return: A tuple of selected files, None if cancelled.