Unknown file format (Mpg)

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Bsplayer 809 says Unknown file format when I try to play an .mpg file. The strange thing is that the video still starts but in a Activemovie window in bsplayer. The mpg files I´ve tried works fine in version 808 and older version, they also works in wmp and power dvd.

I´ve tried to reinstall codec and bsplayer but I still have the same problem.