PBP FFFFIIIILLESS UUGH

how do i change a PBP file into a CSO? please. thanks

Why would you need to? A CSO file has an initial PBP file inside that the psp can read and launch. What is the file? a PS1 game or something?

I'm guessing you have a PSone game? If so it goes in the memory stick under GAME.

they are probably ps1 games. How would i make the PBP file work on my PSP?

The psp's launch file type is PBP, all you gotta do is stick the file in a folder and stick the folder in the 'GAME' folder. You can then launch the PHP file in the XMB in the game Tab.