Stuff

$files=array(
'05012012.xlsx'
,'06122011.xlsx'
,'10012012.xlsx'
,'23122011.xlsx'
,'26122011.xlsx'
,'28122011.xlsx'
,'29122011.xlsx'
,'30112011.xlsx'
,'30122011.xlsx');

		/**	So we include PHPExcel to perform the calculations	**/
		include 'PHPExcel/IOFactory.php';

$f='03012012.xlsx';
	$excel = PHPExcel_IOFactory::load($f);
	$writer = PHPExcel_IOFactory::createWriter($excel, 'CSV');
	$writer->setDelimiter(";");
	$writer->setEnclosure("");
	$writer->save(str_replace('.xlsx','.csv',$f));