Someone said :
My Brother has a samsung internet tv. It came preloaded with rte player, youtube and a few others, you can download others I don't know how though. It recently updated itself and added tv3 player.
What I meant was the likes of Windows Media Player, VLC, Quick Time or Real Player. The reason I ask was I was thinking about when you download files from the likes of Pirate Bay and they will only play with certain players. Maybe this isn't something you can do on a smart tv, I don't know at all.