old_contents: # -*- coding: utf-8 -*-
  from mfr.core import FileHandler, get_file_extension
  from mfr_movie.render import render_movie_tag
  
  # TODO(asmacdo) add exporter
  exporters = {}
  
  EXTENSIONS = [
      '.mp4',
      '.avi',
      '.ogv',
      '.wmv',
      '.webm',
  ]
  
  
  class Handler(FileHandler):
      """The movie file handler."""
  
      renderers = {
          'html': render_movie_tag,
      }
  
      exporters = exporters
  
      def detect(self, fp):
          return get_file_extension(fp.name) in EXTENSIONS
  
new_contents: # -*- coding: utf-8 -*-
  from mfr.core import FileHandler, get_file_extension
  from mfr_movie.render import render_movie_tag
  
  EXTENSIONS = [
      '.mp4',
      '.avi',
      '.ogv',
      '.wmv',
      '.webm',
  ]
  
  
  class Handler(FileHandler):
      """The movie file handler."""
  
      renderers = {
          'html': render_movie_tag,
      }
  
      def detect(self, fp):
          return get_file_extension(fp.name) in EXTENSIONS
  
subject: remove blank exporter, if desired, this can be an issue