If the game shuts down abruptly during an update, or if data sectors on your hard drive degrade, x64f.rpf can become corrupted. This causes the engine to crash to desktop as soon as it attempts to load a vehicle or asset bound to that specific archive.
Because x64f.rpf controls fundamental game assets, errors involving this file usually result in immediate game crashes (Crash to Desktop/CTD) or infinite loading screens. 1. "Corrupt Game Data" Error on Startup x64f.rpf