Modding GTA 5 usually involves editing the contents of these x64 files. Because x64u.rpf contains core assets, it is often a target for:
is a critical data archive for Grand Theft Auto V (GTA V), part of the game's core installation directory. It is one of many "Rage Package Files" (.rpf) used by Rockstar Games to store and compress game assets like textures, models, and audio. Core Role in GTA V Asset Storage X64u.rpf
The .rpf extension is famously associated with (Grand Theft Auto IV/V, Max Payne 3, Red Dead Redemption), standing for Rockstar Package File . These files act as compressed archives (similar to .zip or .rar ) that contain game assets like models, textures, and collision data. The naming convention X64 usually denotes 64-bit architecture resources. Modding GTA 5 usually involves editing the contents