: Inside OpenIV, go to Tools > ASI Manager and install "ASI Loader" and "OpenIV.ASI".
C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto V\x64f.rpf x64f.rpf
Because this is a core file, corruption or accidental deletion often prevents the game from launching or causes a "Detected modified game files" error. : Inside OpenIV, go to Tools > ASI