Use a modern extraction tool like 7-Zip . It is free, open-source, and handles heavy compression better than standard Windows tools.
Most "backups" or custom ISOs require a PS4 running a specific older firmware version (like 9.00 or lower) that allows for a "Jailbreak" or Homebrew Enabler (HEN). ps4 iso games highly compressed
Smaller files mean you can get into the game faster, especially if your internet speed is modest. How to Handle Highly Compressed Files Use a modern extraction tool like 7-Zip