def add_rfile(self, name, help, required=True, default=None):
if isinstance(default, str):<EOL><INDENT>default = default.replace('<STR_LIT>', self.directories.data_path + os.path.sep)<EOL>default = default.replace('<STR_LIT>', self.directories.user_data + os.path.sep)<EOL><DEDENT>self._options[name] = Option(name, '<STR_LIT>', help, required, default=default)<EOL>
Add a new option with a type of a readable file. This is the same
as the string option with the exception that the default value
will have the following variables replaced within it:
        $USER_DATA The path to the users data directory
        $DATA_PATH The path to the framework's data directory
This will NOT check that the file exists or is readable.

:param str name: The name of the option, how it will be referenced.
:param str help: The string returned as help to describe how the option is used.
:param bool required: Whether to require that this option be set or not.
:param str default: The default value for this option. If required is True and the user must specify it, set to anything but None.