It may perform an undesired format conversion in rare cases.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=39754Signed-off-by: Józef Kucia <jkucia@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>