Netflix is now bringing its own brand of ULTRA HD 4K resolution material to users on Windows 10, but there's a catch. You need to be using a very modern processor and, er, Microsoft Edge. Probably best to stick with what you've got a move a bit further away from the screen.
It would appear to be a money-motivated promotional thing for now, as Microsoft's Windows blog is selling this as an exclusive, one that requires a 7th Gen Intel chipset to even work -- that's something built around the more efficient 14nm Kaby Lake framework. The Kaby Lake series has only just gone on sale, so it would appear Microsoft and/or Intel are trying to use Netflix UHD as a selling point for the new hardware, as if people might buy a new laptop or desktop to unlock 4K material.
Which could happen. Getting people to use Edge as their browser's a bit more of a longshot, though. The right subscription, a 4K monitor, and an internet connection of a bit more than 2.9Mbps are also needed, further limiting the chances that anyone's actually likely to be doing this tonight. [Windows]