Setting $httpCharset = 'utf-8'; works fine here. With which program did you open the downloaded CSV file? It's possible that the software didn't properly recognize the character encoding.
We've tried to open the CSV file in both Excel and OpenOffice. After reading a bit more about this, it seems CSV files have a problem with character encoding - hence, opening the file in OpenOffice and then choosing UTF-8 as the charset when importing the file, it works OK - not quite sure how to do the same in Excel, but oh well. Then re-saving the file as an Excel (.xls) document, it maintains the right character encoding.
Not ideal if a client runs into this problem, but otherwise works OK now.
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