Long time lurker first time poster? lol anyway, I have an Apple TV I think 3rd gen. It is the one last one with the silver remote. My setup is a local wifi system no internet. my MacBook will share screen but I can not access any movies on my MacBook. I see them there, but when I try to play it from the atv it tells me its unsupported file. I downloaded them straight from my iTunes into the laptop. It from time to time tells me I have to sign in but there is no internet where we are. I have to take the laptop into town to download movies. is the atv3 not able to stream movies off the laptops anymore?