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The following is an assumption because your question does not document technically so far what the actual cause is.
However what can be said is that you have a character encoding related issue here.
Save your INI file with the UTF-8 encoding and this should work. I assume your PHP script outputs UTF-8 to the browser and the values in the INI file are not UTF-8 encoded. If you save the INI file with UTF-8 encoding, this should then work.
The key point here is not so much the "UTF-8" but that you save the INI file with the right character encoding that is expected from the application you use. For example if your application uses ISO-8859-1, then save the INI file with the ISO-8859-1 encoding.
Both - the INI file and the PHP script - need to speak the same "language".
You can add a "translator" that is able to help you bring two different "languages" together. Such a translator (or more correctly re-encoder) is iconv:
$ini_iso88591 = file_get_contents("sad - Kopie (6)/folder.ini");
$ini_utf8 = iconv("ISO-8859-1", "UTF-8", $ini_iso88591);
$ini_array = parse_ini_string($ini_utf8, TRUE);