Downloadable content you own can go into this folder.

Copy the content files from your own Xbox 360's storage here: they are in
Content\0000000000000000\4E4D07D3\00000002 and have long names without an
extension. Keep those names. Folders inside this one are searched too, so a
copy of the whole Content folder works as well.

Each time the game starts, it adds the files here that are new or have
changed. Only content for Ridge Racer 6 is used; anything else is left alone.
The launcher's DLC page can add content too, from anywhere.

No content comes with this game, and none is downloaded.
