If you take an orignianl version of CMS Made Simple, it does not provide any config.php file. If it is a new installation, you should create one (with notepad f.i.) and leave it empty then save it...
I have a multi-lingual website (English, French, Dutch) which is structured as follows:
pageName_EN.html = English,
PageName_FR.html = French
PageName_NL.html = Dutch