Some tools and emulators use a .psp extension (e.g., PSPlay or older homebrew), but this is not a standard archival format. It is almost always either:
Maintaining these archives allows modern handhelds (like the Steam Deck, ASUS ROG Ally, or Analogue Pocket) and smartphones to emulate the PSP library accurately. By using CSO files within these archives, preservationists can store thousands of titles in a relatively small amount of digital space. cso psp archive top
, designed to reduce game file sizes while remaining playable via Custom Firmware (CFW) Some tools and emulators use a
Over the years, many CSO PSP archives have been created, containing a vast library of games. Here are some of the top-rated CSO PSP archives: PSPlay or older homebrew)