MPlayer is described as 'Movie player which runs on many systems (see the documentation). It plays most MPEG/VOB, AVI, Ogg/OGM, VIVO, ASF/WMA/WMV, QT/MOV/MP4, RealMedia, Matroska, NUT, NuppelVideo, FLI, YUV4MPEG, FILM, RoQ, PVA files, supported by many native, XAnim, and Win32 DLL codecs' and is a very popular Media Player in the os & utilities category. There are more than 100 alternatives to MPlayer for a variety of platforms, including Windows, Mac, Linux, Android and Flathub apps. The best MPlayer alternative is VLC Media Player, which is both free and Open Source. Other great apps like MPlayer are MPC-HC, MPV, AIMP and PotPlayer.
MPlayer WW is the Windows port of mplayer