ISO + Audio, ISO "invisible" for Audioplayers

hy,
I use the API and everything works great… except if I burn <I>audio data</I> AND <I>data</I> on one disc, the data is recognized on every cd-player as track 1 without any soundsignals…

how can i prevent this? So that the <I>data</I> is “invisible” to cd players…

just didn’t know that CD Extra is a synonym CD Enhanced