It's too cloudy here for me to see any moon. Unfortunately LW's media player is very, very basic. You only have the play, stop, pause & skip to start/end. No volume control.
If you're not sure where your music files are, well neither do I. Do you play them from your shared folders/incomplete folders? Go to your LW's menu Tools-Options & Sharing. This will show you where your shared folders are. Make a note of the folder names, path & search for it using your system search engine (Explorer). Once u know where they are, you can direct any of your music players to open them from there.
These links 'might' have some helpful pointers for u.
Link 1 and also
Link 2 I think the clouds are lifting. Can u see the moon yet.