To play via Xenia, you would need an ISO or XEX file of the game. Legally, this should be ripped from your own physical disc.
The "deep story" behind these downloads is typically one of two things: a using a game that doesn't exist on the platform, or a pirated emulator bundle 1. The Myth of the Native PC Port Forza Horizon 1 Pc Download Without License Key HOT-
Modern Horizon games feel like theme parks. Mexico (FH5) is huge but empty. Britain (FH4) is pretty but sterile. Colorado (FH1) had mountains, canyons, a pink golf course, and a dusty airfield. It felt like a real place you could road trip to. To play via Xenia, you would need an