code: def describe_file_extensions(self):
          
          (extensions, types) = self._call("describeFileExtensions")
          types = [DeviceType(a) for a in types]
          return (extensions, types)
docs: Returns two arrays describing the supported file extensions.
          
          The first array contains the supported extensions and the seconds one
          the type each extension supports. Both have the same size.
          
          Note that some backends do not work on files, so this array may be
          empty.
          
          :py:func:`IMediumFormat.capabilities` 
  
          out extensions of type str
              The array of supported extensions.
  
          out types of type :class:`DeviceType`
              The array which indicates the device type for every given extension.