media players

Can someone explain to me what determines which media player will play back your media and which one it may be stored on at any given time?

Some get saved on Dell's musicmatch others on iTunes etc. I think it would be good to store my music in one place but Im new at this.

Can I get some help please?

Thanks!

can you explain better? Is it that differnt file types open in a differnt player and not one? If you want all files to be played in one player on windows XP go to start>Control Panel then click on Add/Remove program then on the left click Set Program access and defualts then there should be three things

Microsft windows
Non-Microsoft
Custom

check custom and expand it were it says choose a defualt media player: check witch ever one you want to use