Sorry to continue on the offtopic here, but in relation to the Forza Horizon 3 unpacking/converting and whatnot, the files that @Lundy see are still encrypted by EFS... The files/folders that are in there are just named in an odd pattern by Microsoft, I suppose as part of the encryption/DRM. More reading here. Can't even move the files or anything due to the way UWP games seem to work.
You could either decrypt your own files then try unpacking and converting, or somehow get your hands on that debug copy of the game that was accidentally pushed to the Windows Store last (?) week (already decrypted as far as I know, but it's technically piracy I guess so I can't really recommend lol).
"gq6$l" is the media folder, and inside that, "^l4~" is the cars folder.