The battle for customer share in the music services space begins:
"Apple iTunes for Windows prevents Musicmatch Jukebox from working with the iPod by deleting critical files used by Musicmatch."
Is trying to lock your competitors out a decent tactic? Apart from the fact that it's so 90s, it's really kind of pointless. Focus on giving user what they value - not taking away what they value (even if it's your competition).