The gtaiv4trainer.rar file you have requested: GTA IV / Trainers / GTA IV - +4 Trainer - 287.81kb is not available. Perhaps try browsing all files for the game Grand Theft Auto: San Andreas and upload any files you want to share or are missing. This is the only information we could locate:
Here is a fairly simple trainer for Grand Theft Auto IV, this gives you four different options that you can use within the game, including Unlimited Health (Invinsible almost), Unlimited Money, Unlimited Grenades and Never Wanted. This is a fairly good Trainer, although mainly limited in its options ingame.