Winamp comes with iPod support, how does that relate?
Starting with Winamp 5.2, the Winamp distribution contains a different iPod handling system, it is part of the generic portable music player support (pmp). ml_iPod is much older and at the moment has more features than the pmp_* plugins. Don’t confuse these two modules. If you want to use ml_iPod (which this site is dedicated to), you must not install the iPod support that comes bundled with Winamp. If you have done so already, you will get the opportunity to uninstall it during the ml_iPod installation.