Before you "upd" (update) or modify your player files, follow these industry-standard best practices used by the modding community:
: Modern tools like the OpenIV Mod Folder system allow you to place a copy of playerped.rpf into a dedicated /mods/ folder. The game will prioritize the modded version while leaving your original "vanilla" file untouched in the main directory. Restoring the File After a Failed Update (Upd)
: The safest method is to navigate to your GTA IV installation folder and copy the playerped.rpf file to a completely separate "Backup" folder on your hard drive.