If you want to install mods in
All you need to do to use GTA IV Magic Patcher is unzip the file, backup the existing filelist.pak in your Rockstar Games directory. Then replace the original file with the filelist.pak in this archive. You will now be able to install mods without any problem. In an ideal world, this would be an application that did this for you automatically, but it doesn't require too much effort.
GTA IV Magic Patcher is a simple way to start having more fun with GTA IV
Download GTA IV Magic Patcher 1.0.2.0 in