Any number of media players can be used by any user.
Generally...installing any player mimics the behavior of WMP when it comes to designating itself as the primary program to be used for opening all media files...but such only happens if the user allows it to do so with tacit approval.
In any case...programs which open a given file can be changed anytime by a user on an individual file type basis...by going to Explorer view of My Computer, then clicking Tools/Folder Options/File Types...and then scrolling the list to chqnge whatever program user desires to open a given file type.
I use WMP to open .mpgs, Real Player to open .flvs, Musicmatch to open .mp3s...and I have a few other players installed. Regardless of which player opens a file, they can play in just about any of the players I have installed.
You may want to try MediaMonkey and VLC.
Edited by hamluis, 18 January 2013 - 02:15 PM.