X64u.rpf Better -

or found yourself staring at a "Failed zlib call" error, you have probably encountered the

If you see X64u.rpf in your install:

This file is 64‑bit only . If you’re still running the 32‑bit version of GTA V, you’ll need to upgrade before using X64u.rpf. X64u.rpf

file. Because these files are massive, a single bit out of place can prevent the game from launching. Verify Integrity : If you suspect is broken, the first step is to use the Verify Integrity of Game Files feature on Rockstar Games Launcher Manual Deletion or found yourself staring at a "Failed zlib