Well apparently this guy has played Skyrim.
Fubar CopyCatt's Profile
Here is a picture of it and he has 1 achievement for it.
He could have added in the gpd because it seems that he has modded GS and if you look at his profile from your Xbox he has had LIVE for 8 years.
Skyrim's .gpd is 425307E6.gpd, but where do you find the gpd????
Anyways post what you think on if he actually has the game or if he just added in the .gpd