  Starting with a vertex algebra $V$, a finite group $G$ of automorphisms of
$V$, and a suitable collection of twisted $V$--modules, we construct (twisted)
$D$--modules on the stack of pointed $G$--covers, introduced by Jarvis,
Kaufmann, and Kimura. The fibers of these sheaves are spaces of orbifold
conformal blocks defined in joint work with Edward Frenkel. The key ingredient
is a $G$--equivariant version of the Virasoro uniformization theorem.
