Along with this, the application is absolutely essential to apply most GTA IV graphics mods such as the one that replaces the pedestrians for Final Fantasy characters or that which lets you play the game as the main character from Modern Warfare.
The application is pretty easy to use, and you don´t need any extensive tutorials or manuals to get started. Generally speaking, you just have to open the file you want to modify, and replace it with another.
SparkIV modification is a very useful tool and allows you to customize your GTA IV experience at will. And best of all, it does this from a simple and accessible interface.