: Use a program like 7-Zip or WinRAR to uncompress the files.
If you are looking for "highly compressed games" because you’re low on storage, there are better, safer ways to manage your library without downloading sketchy files: Use the "PS3 ISO Rebuilder" rpcs3 highly compressed games work
If your goal is to save disk space without breaking the emulator, you shouldn't use general file compressors. Instead, use these emulator-friendly methods: : Use a program like 7-Zip or WinRAR to uncompress the files
While the download might be 5GB, it will still take up the full 40GB on your hard drive once extracted. The Risks of Using Pre-Compressed Games there are better