Are you having trouble playing common formats for movie files these days?  The default Windows 10 media player can play a lot of formats, but if you find that it doesn’t play the format you want–here is what you can do.

  • Download Combined Community Codecs Pack which includes Media Player Classic.  http://www.cccp-project.net/
    Play mkv mp4 in Windows 10
    The Combined Community Codec Pack is a simple playback pack for Windows with the goal of supporting the majority of video formats in use today.
  • Download VLC player which is nice (although I would highly recommend Media Player classic in combined community codecs).   VLC Player also has a version for Android that can play a lot of files and even turn your phone screen off when you are casting via Roku to your TV or other screen cast apps.

VLC Player play all formats mkv

http://www.videolan.org/vlc/index.html