Like Jon Skeet pointed it's difficult to understand your situation, however if you have access only to final text, you can try to use iconv for changing text encoding.
I.e.
$text = iconv("Windows-1252","UTF-8",$text);
I've had similar issue time ago (with Italian language and special chars) and I've solved it in this way.
Try different combination (UTF-8, ISO-8859-1, Windows-1252).
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