If the goal is to deliver content from a media server to a preamp / receiver that only has an ethernet port the most common solution is to get a "wireless bridge" --
http://www.bhphotovideo.com/bnh/controll...=&A=detailsTwo of these can be configured as "invisible ethernet" where one is on the media server that does not have a wireless connection and the other is on the preamp / audio receiver that does not have built-in WiFi...
Technically a the Oppo BD-105 (and probably other models...) is also capable of getting audio files via network connection --" in-home network media sharing via My Network which is capable of connecting with DLNA and SMB/CIFS clients. Additional online streaming applications may also be added with future firmware updates."
http://download.oppodigital.com/BDP105/BDP-105_USER_MANUAL_English_v1.4.pdf The Oppo DACs remain among the most revered choice and quite a few use the BluRay player as a replacement for a preamp...