Use a modern extraction tool like 7-Zip . It is free, open-source, and handles heavy compression better than standard Windows tools.
A "Highly Compressed" game is a file that has been processed using advanced archival techniques to significantly reduce its size without removing core game data. For example, a 40GB PS4 title might be compressed into a 10GB or 15GB archive. How Compression Works: ps4 iso games highly compressed
The standard 500GB or 1TB internal HDD on a PS4 fills up incredibly fast. Use a modern extraction tool like 7-Zip