def link_file(filename, title = nil, anchor = nil) # rubocop:disable Lint/UnusedMethodArgument
      return filename.filename if CodeObjects::ExtraFileObject === filename
      filename
    end
def link_file(filename, title = nil, anchor = nil) # rubocop:disable Lint/UnusedMethodArgument
      return filename.filename if CodeObjects::ExtraFileObject === filename
      filename
    end
Links to an extra file

 @param [String] filename the filename to link to
 @param [String] title the title of the link
 @param [String] anchor optional anchor
 @return [String] the link to the file
 @since 0.5.5