Corrupted Xex programs

Hi all I am new to the modding scene and corrupted xex program on my hdd that came with my rgh the guy i bought the rgh was very helpful in trying to resolve the issue for me then he made the suggestion being i have a xbox 360 transfer cable to use horizon to sort out the problem xex program causing the isue i am having only thing is i cannot find the xex programs using horizon to resolve the issue need help plz