Copy 1991.dll / GTAIV.exe and run GTAIV to yourself Example GTA IV folder: C:\\Program Files \\Rockstar … This is necessary in order to have one gtaiv.dll file and one gta4.exe file in the game folder.
Find a folder for GTA IV on the disk with the game.
Copy it to where it is more convenient for you to play.
Or copy to another drive.
Then launch your game.
We start the game.
And you can see it in the task manager.
And when you launched the game and started playing.
There will be an inscription GTAiv.dll.
If you have gtaiv.dll files.
Then you can copy them.
And you will have one game folder and two file folders.