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//this works
Project
  Assets
    video.wmv  Build action:Content Copy:Copy if newer
    
<MediaElement Source="Assets/video.wmv"></MediaElement>
<MediaElement Source="/Assets/video.wmv"></MediaElement> //this will not work somehow   
<MediaElement Source="./Assets/video.wmv"></MediaElement> //this work again   

bin
  Debug
    Assets
      video.wmv
    Project.exe
    Project.pdb
    Project.exe.config