Comment 1 for bug 1031933

Looking over the libunity code at the moment, the entry point is

public MusicPlayer (string desktop)
Which internally this desktop string is used create a new DesktopAppInfo

http://www.valadoc.org/#!api=gio-unix-2.0/GLib.DesktopAppInfo.DesktopAppInfo

Going on the spec passing in names of apps won't work, we need the name of the desktop file.