def _split_tkstring(text):    
    while text:
        part, sep, text = text.partition(u' ')
        if part.startswith(u'{'):
            if part.endswith(u'}'):
                yield part.lstrip(u'{').rstrip(u'}')
            else:
                rest, sep, text = text.partition(u'}')
                yield part.lstrip(u'{') + u' ' + rest
                text = text[1:] #space
        else:
            yield part


def askopenfilenames(*args, **kwds):
    result =  tkFileDialog.askopenfilenames(*args, **kwds)
    #BUG in python http://bugs.python.org/issue5712
    if isinstance(result, unicode):
        result = tuple(_split_tkstring(result))
    return result