To play the M4A files on windows media player, you have to download the latest version of windows media player.
ການຫລິ້ນໄຟລ໌ M4A ໃນ player windows media, ທ່ານຈໍາເປັນຕ້ອງດາວນ໌ໂຫລດສະບັບຫລ້າສຸດຂອງຜູ້ນ windows media.