Ok so.. say you had a game's dlc that was not drm free. Could you open it in horizon and pull up the contents tab, then extract the file that corrupts it? Maybe manipulate that file? It's just a thought really. Or maybe delete that file that corrupts it.

Also here's a link for free DLC that is DRM free, which means that is usb transferable to your console and will not corrupt.
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This is for Borderlands 1 and 2, Saints Row 3, Fallout 3 and Nv, and a few arcade games