http://autorunwizard.com/autorun/faq-autorun-answer.cfm?AutoRunNumber=239
https://msdn.microsoft.com/en-us/library/dd562624%28VS.85%29.aspx

Command Line Options Available for Windows Media Player 
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The Windows Media Player has several command line options:

    /open: Open the file, don't automatically start playing.
    /play: Start playing the file as soon the player is launched.
    /close: Close the player after playback (only works when used with /play).
    /fullscreen: Start the file in full-screen mode.
    /new: Use a new instance of the player.

For example, to play a file and close the player when done:

Mplayer2.exe /play /close C:\Asfroot

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"c:\Program Files\Windows Media Player/wmplayer.exe"

"c:\Program Files\Windows Media Player/wmplayer.exe" /play D:\Eigene_Bilder-r700-2015_10\Martin_Teutscher-Ashleys_Bar-Ferragudo-2015_11_06