I have been searching for a bit on this, either this is not an issue for anyone, no one has wanted to do this, or I am not searching the correct terms.
I have a Kenwood X993
that I use a USB drive for playing music. Kenwood has a program (Kenwood music Editor) for managing content.
I want to use Winamp to manage content. The drive and tracks show up fine in Winamp; however no playlists. Playlists I create do not show up in the car. I cannot find anything that tells me Kenwood's playlist format, or any plugins that might help. There is a musiclib.db and a kenwood.dap file that seem to drive content for the stereo.