Grand Theft Auto IV\GTAIV\pc\models\cdimages\playerped.rpf
If you are using Steam, verifying game integrity will restore the original file but will also wipe all other mods you have installed. Having a manual backup of just playerped.rpf allows for surgical restoration. Common Modding Tools for .rpf Files Please help! - GTA IV Modding - The GTA Place Forums gta 4 playerpedrpf backup