Try to fix with utf8 bom

sig.php

@@ -65,7 +65,7 @@ $template_contents = str_replace(
 		header('Content-Description: File Transfer');
 		header('Content-Disposition: attachment; filename='.FILENAME);
 		header('Content-Transfer-Encoding: binary');
-		//echo "\xEF\xBB\xBF"; // UTF-8 BOM
+		echo "\xEF\xBB\xBF"; // UTF-8 BOM
 	} else {
 		header('Content-Disposition: inline; filename='.FILENAME);
 		header('Content-Type: text/html, charset=utf-8');