  The flavor changing transitions in the c->u gamma, c->u gamma gamma and c->u
l+ l- offer the possibility to search for new physics in the charm sector. We
investigate dominant decay mechanisms in the radiative decays D->V gamma,
D->P(V) l+ l-, D->gamma gamma and we discuss chances to see physics beyond the
standard model in these decays. In addition, we analyze Cabibbo allowed D->K pi
gamma decays with nonresonant K pi, and we probe the role of light vector
mesons in these decays.
