My Little Pony Friendship Is Magic S04E25 Twilight's Kingdom Part 1 1080P HDTV x264 DD5 1-thebib62 mp4

No problem. I believe the issue you're having is with the file being in 5.1 Dolby. Not sure if WMP or WMC can handle that or not.

ok so i got all the current episodes (including the 2 that just came out today) im planning on watching them with my daughter to watch all of season 4 in 1 step pretty much. well the file does not like windows media player (wont play sound) it will work on vlc player. but will not run on windows media center(thats were im running the videos throught the xbox media center so can enjoy on the large screen. other then that problem its a good file. and really quick torrent release thanks much ^^

I use Windows Media Classic and K-Lite codec pack. It's quite dated already, but works like a charm.

My friend once told me that MP4 container does not normally support 5.1 AC3, and it was surprising to him that thebib62's releases contain Dolby 5.1. However it seems that having a bunch of codecs makes it playable. Probably there are no suitable ones on your system (VLC uses own codecs), so installing a decent codec pack should fix that for you.