Firstly, rest assured, I promise, I am not talking about illegal torrents. Got it? Okay, I don't want to say more. If I download a .MKV file/movie in 720p or 1080p, do they come in the 5.1 surround sound (not stereo), or does it depend on the file? Can I know by doing a CMD+I to the file? And what's the difference between 5.1 surround sound and stereo? I've looked around but it's very technical. Easy definition?