Settings > My Installed Games > GTA V > Verify Integrity . Method 2: OpenIV "Mods" Folder Recovery
x64a.rpf and using "Verify Integrity" sometimes fails to replace it correctly, leading to a loop of broken files. Safe Ways to Restore the File Instead of downloading from untrusted third-party sites—which can carry malware or version mismatches—the recommended methods are: Steam/Epic Verification x64a.rpf download
This is the fastest and safest way to recover a genuine x64a.rpf file. Settings > My Installed Games > GTA V > Verify Integrity
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