Since Xbox One does not provide native support to connect to your WMP media center (hopefully they add this in a future update). You can use the Linada app from wp8 store to connect to your media center and stream it directly to your Xbox One. I am even able to play .mkv files without any issues. You can queue up video files to play, so no interruption of video play. There is no need to add another "server software" on your pc. It works fine with WMP media streaming option turned on.
I am trying out different IOS apps that work similar since my wife had an iPhone/ipad for her to use when I am not around.
Hope this helps for anyone that wants to play video files from their PC to Xbox One