Many popular mods (e.g., NaturalVision Evolved, LA Reforged, or simple car mods) require you to replace files inside X64u.rpf , such as vehicles.img or pedprops.img .
: To avoid corrupting your game or being banned from GTA Online, you should never edit the original file. Instead: Open x64u.rpf in OpenIV. Select "Copy to mods folder" when prompted. Edit the copy located in GTAV/mods/x64u.rpf . X64u.rpf