Forza Horizon 3 and Halo 5: Forge are the first games to employ Microsoft's encrypted appx format digital rights management (DRM), with the aim of combating piracy.
In short, once you install either game, the Encrypting File System feature in Windows does its thing, after which the application files are no longer accessible, putting modding and out-of-game tweaking at risk.
Forge has featured some mods already, but this may be due to it being free to play and only some files being encrypted; Forza, it seems, is in a rougher spot.
There has been speculation the DRM causes performance issues in both games, but given how smoothly Forge runs, it's very much unfounded.
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