Spreadsheet Excel Writer - writeUrl() problem

Question

I have to use PEAR extension "Spreadsheet_Excel_Writer" and I need to insert URLs into one of the columns, so I use this line in the loop:

$sheet->writeUrl($line, $colNumber, 'http://www.google.com', 'string');

$line is being changed through iterations. In the downloaded file I get something like this: "瑨灴⼺眯睷朮潯汧⹥潣m" instead of "http://www.google.com". Tried to use https, but in that case link will not be inserted at all. Who encountered this problem, could you help please?