It sounds like you're working with PS4 homebrew tools, specifically
The release of represents a significant milestone for the PlayStation homebrew community, offering a streamlined way to package PS1 games for play on modern hardware. This utility simplifies the process of creating "fake PKGs" (fPKGs), allowing enthusiasts to run classic titles with the benefits of modern emulation. What is PSXFPKG? psxfpkg v02 top
The success of PSX-FPKG is part of a larger suite of tools designed to bring classic PlayStation experiences to the PS4. Other popular tools in this ecosystem include: : For converting PlayStation 2 ISOs. PSP-FPKG : For bringing handheld classics to the big screen. It sounds like you're working with PS4 homebrew