Most commonly, this is a compressed ISO file of the original game disc. Because the original GT4 was massive for its time (nearly 10GB as a dual-layer disc), it is often zipped to make downloading easier.
It could also be a fan-made expansion like the popular Gran Turismo 4 Spec II Mod , which adds modern features, new car sounds, and improved visuals. How to Use Your GT4 Files File: Gran.Turismo.4.zip ...
Download the latest Nightly build of PCSX2 for the best performance and compatibility. Most commonly, this is a compressed ISO file
Most commonly, this is a compressed ISO file of the original game disc. Because the original GT4 was massive for its time (nearly 10GB as a dual-layer disc), it is often zipped to make downloading easier.
It could also be a fan-made expansion like the popular Gran Turismo 4 Spec II Mod , which adds modern features, new car sounds, and improved visuals. How to Use Your GT4 Files
Download the latest Nightly build of PCSX2 for the best performance and compatibility.