reference http://store.sony.com/webapp/wcs/stores/servlet/ProductDisplay?catalogId=10551&storeId=10151&langId=-1&productId=8198552921666413405#specifications

The sony website @US lists the Format(s) Supported by z1050 : MP3 / WMA / AAC-LC / L-PCM, while the atrac is not listed, which is the exclusive looseless format of sony. I am confused. I was thinking z1050 is sony's flagship! Anybody gets some idea?