X64f.rpf | Fix

You can use tools like the GTAV File Check to compare your file's MD5 checksum against official values to see if it's corrupted.

from the main directory into this new mods folder. x64f.rpf

The x64f.rpf file is a type of data file that is often associated with Rockstar Games' proprietary game engine, the Rockstar Advanced Game Engine (RAGE). RAGE is a powerful game engine used in various Rockstar Games titles, including Grand Theft Auto IV, Grand Theft Auto V, and Red Dead Redemption. You can use tools like the GTAV File