Windows Media Player as everyone knows, comes packaged within Microsoft Windows, and is able to play almost all the music formats except .RAM, which is a copyright format by RealOne.
RealOne, I hope atleast ppl have heard of it!!
Its a comparatively better music player IMO, small, compact, easily upgradeable, + the file sizes are about 20% of the formats in WM.
A Normal mp3 file is 5 MB in WM, but in .ram format, the size comes down to about 1MB, with no loss in quality!
And moreover, RealOne can play all formats, including mp3s.
If uve as yet not tried it, I say, atleast try it once.