Are you going to do something with them besides stare at them in 3ds and show them off? Make a fun map or something. Alteration is a great tool for that.
It really looks nothing like Horizon. I'd like to see you mod NFS Shift in a hex editor, or MW2. Why don't you try Forza 3 while you're at it. Anyways, the latest update has a FATX viewer, Forza 3 save editor, GTA IV save editor, and ODST profile campaign progress.
The only thing this program has in common with Horizon is the Castle Crashers editor and thats a stretch. These editors took a lot longer than 5 mins and I'd like to see you make them all in 5 mins each. You're sounding arrogant when you don't know how much work went into it.