Place them in Hdd1:\Games\Tomb Raider Anniversary\ .
Are you still rocking this on your RGH setup, or have you moved on to the newer trilogy? Tomb Raider Anniversary -Jtag RGH-
Modded systems allow for easier management of DLC and potentially user-made texture swaps or trainers that can modify gameplay attributes like infinite oxygen or health. Place them in Hdd1:\Games\Tomb Raider Anniversary\