code: def output_extras(self, output_file):
          
          output_directory = dirname(output_file)
  
          def local_path(name):
              return join(output_directory, self.path_helper.local_name(name))
  
          files_directory = "%s_files%s" % (basename(output_file)[0:-len(".dat")], self.path_helper.separator)
          names = filter(lambda o: o.startswith(files_directory), self.output_directory_contents)
          return dict(map(lambda name: (local_path(name), name), names))
docs: Returns dict mapping local path to remote name.