I got the 2017 E 200 ( W 213 ) with the widescreen cockpit and COMAND online, I wonder how could i play videos on the middle screen??

 

You can while the transmission is in the "Park" position. The manual has the instructions on how to play media files. If you're thinking bout hacking the system, I wish you the best of luck. Every time I brought the car to the dealer for issues relating to the COMAND system, they have to keep it for a couple of days while waiting for "software updates" or "additional assistance from MB". You'll need specific tools and knowledge to get around the COMAND system, not mentioning the risk of having the warranty voided.

 

You need an S Class for that capability. It has a special LCD so the video can only be viewed from the passenger side. The feature is called Split View.