Click on the Library window tab. Select a file from your Shared folder, & then click launch. You can only launch files that are 100% downlded. I just checked. LW Classic does not have a media player or preview button. It only has a Launch button.
LW Classic does not have iTunes support. You'll need to make either iTunes or QuickTime player your default for playing music. Perhaps this thread might also help
http://www.gnutellaforums.com/showth...threadid=51661
If you want to know more about setting up default for any music or video file you downld, search the word MIME on the forum. Press the search button above right. And if you type in my name as the user for the search user's posts, then you'll find example images for different scenarios.