Aggressive antivirus software sometimes quarantines or blocks large .pak files because they look like compressed archives containing executable-like data. This is a false positive.
If you see Access Denied or Unable to create , Windows permissions are blocking the game or launcher. Pakchunk0-windowsnoeditor
If your game is crashing and citing this file, it is often due to data corruption or permission issues. Pakchunk0-windowsnoeditor