I take it you mean the GPD file for modding. The name of the Halo: Reach .GPD file is 4D53085B.gpd Message me over Xbox LIVE if you want a modded GPD file.58580833, Block Party, Xbox LIVE, Other 585407D3, E3 2008, Xbox Console Manufacturi Other 4D53085B, Halo: Reach, Bungie Studios, Shooter, 2010. By the way mate, about your question, I think the "Designer DLC" might be attached to your Xbox 360 profile/save data as a .gpd file, you just need to make a