1.Windows media player 9 series is design by the Microsoft . the windows media player 9 is first coming in window xp professional and now a days Microsoft uses same concept but little feature is change and some userface.
2.Windows media player 9 is worst media player and its contains very less codec file by default it support .wmv format.it cannot player format like mp4 until you download or install any other media player like vlc, klmplayer, klite.
3.The user interface also too much bad and graphics and equilizer function was also worst.
4.Windows Media player lags on 4K video That was also worst about that.
5.Windows media player does not support .flv, 3gp, .qcelp, .evrc etc.
6.Windows media player cannot access to social media sites
Thanks