what is the connection between D-modules and coordinate bundles?

fix n and a field k of characteristic zero. let G be the pro-algebraic group of automorphims of k[[x_1,...x_n]]. let G_0 be the subgroup of automorphisms preserving the closed point (note that for general T, G_0(T) can be a proper subgroup of G(T)). let X be a regular variety over k and let P be the principal G bundle of formal coordinate systems, naturally a G torsor over X. i hear that there is a connection between P and D_X-modules. what is this connection?

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