'Preprocess: Preprocesses the specified file(s)
Required argument: undocumented, typecode \'alis\'
Keyword argument ExternalEditor: undocumented, typecode \'bool\'
Keyword argument _attributes: AppleEvent attribute dictionary
Returns: Errors for each preprocessed file'

def Preprocess(self, _object, _attributes={}, **_arguments):

    _code = 'MMPR'
    _subcode = 'PreP'
    aetools.keysubst(_arguments, self._argmap_Preprocess)
    _arguments['----'] = _object
    (_reply, _arguments, _attributes) = self.send(_code, _subcode, _arguments, _attributes)
    if _arguments.get('errn', 0):
        raise aetools.Error, aetools.decodeerror(_arguments)
    if _arguments.has_key('----'):
        return _arguments['----']
