OpenIV for GTA 5 is a necessary PC modding tool without which you can't really install a number of mods.

GTA 5 mod install guide: How to install and get GTA 5 mods on PC Here's how to tinker with one of Rockstar's greatest games by finding and installing mods.

They now have to install all three options: ASI loader, OpenIV.ASI, and openCamera. If players get a "create mod folder" prompt, they have to select the "Yes" option.

Once it’s ready, you can use OpenIV to install all the necessary mods to turn your stock GTA into WatchDogsIV. Once all is said and done, what do you get? The most obvious addition is the hacking.