  We discuss the consistency of the D=11 supermembranes with non zero central
charge arising from a nontrivial winding CSNW. The spectrum of its regularized
Hamiltonian is discrete and its heat kernel in terms of a Feynman formula may
be rigorously constructed. The $N\to\infty$ limit is discussed. Since CSNW is
equivalent to a noncommutative supersymmetric gauge theory on a general Riemann
surface, its consistency provides a proof that all of them are well defined
quantum theories. We interpret the supermembrane with central charge $n$, in
the type IIA picture, as a bundle of D2 branes with $n$ units of D0 charge
induced by a nonconstant magnetic flux.
