I am using Windows 7, 64 bit and facing this issue. Windows media player unable to play the file because the particular protocol is not supporting. If you enter a URL in the open URL dialog box try using a dissimilar transport protocol. When I seem at tools options network icon I observe that under streaming proxy settings it’s empty. On a system that works fine I have two HTTP Browser and RTSP None. On this system that not succeed its empty and the configure icon is grayed out so I am unable to modify these settings. I have deleted windows media player 12 and set it back on the system and restarted yet none of these settings are reverse and still the configure button is grayed out.
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