register

# File actionpack/lib/action_controller/mime_type.rb, line 47
      def register(string, symbol, synonyms = [])
        Mime.send :const_set, symbol.to_s.upcase, Type.new(string, symbol, synonyms)
        SET << Mime.send(:const_get, symbol.to_s.upcase)
        LOOKUP[string] = EXTENSION_LOOKUP[symbol.to_s] = SET.last        
      end