My strongly recommended suggestion is... NEVER, EVER install 'any' game in either of C":'s 'Program files'...
This is Win's watchdawg 'UAC's' iron fisted Darth Vader-Vulcan-King Kong death grip controlled terror-tory... & it don't like your tampering about in its domain... even if you tell it you want to & to give you access to do so.
Which, if you're adding in mods or editing/altering files in a game, then by its definition, that's tampering & IT (UAC) will end up reverting things back to what they were before... or 1/2 arsing it, at that & that... will result in weird things happening, if not causing the game/s to flat out, flat line... aka 'CTDville' here you come...
M. M.