Megaton-Tenpenny Grate readme. Adds a pair of grates that allow you to travel from Megaton to Tenpenny Tower quickly and safely. To install put the .esp into the following folder. XP: C:\Program Files\Bethesda Softworks\Fallout 3\Data Not sure if its the same for all Operating Systems. I rock the XP so im not sure. Thank you for downloading. Enjoy the Mod.