It is possible. But you'd need to have your wits about you. It would mean changing your options settings on a regular basis. If you preview a file then LW's media player would play it. But after it's dwnlded, you'd need to change your options so iTunes would play it (or better still, import the file into iTunes library using the Add option directed at the LW dwnld folder.) The following image also shows burn prefs which doesn't apply to you. After every change in the options you'd need to press the Apply button!!! Which in itself seems more practical if you import all your mp3's into iTunes rather than continually change your options settings. Also see this:
http://www.apple.com/support/itunes/...ial/index.html