It sounds like you're looking for a guide on how to handle (usually for PSP, PS Vita, or emulators like RetroArch) and possibly how to manage them from an archive (like the Internet Archive) that’s labeled “exclusive” or unique to a particular set.
If you find an archive, look for NFO files (information files) included in the download. Those "exclusive" notes tell you who converted the file, what settings they used, and whether the multidisc function has been verified. That metadata is the true mark of an exclusive, high-quality preservation. ps1 pbp roms archive exclusive
With modern emulators supporting CHD (another lossless format) and PS1 FPGA cores appearing on MiSTer, PBP’s reign might fade. But for PSP/Vita owners and fans of clean, portable, all-in-one packages, the PBP remains king. It sounds like you're looking for a guide