Download
Popsloader 3.80 M33 and Above and copy the files onto your
PSP. If you're using CXMB or any other plugins, don't overwrite vsh.txt instead edit the text file and include the line ms0:/cxmb/cxmb.prx
.
Enable the popsloader via recovery menu.
Are those files in a folder? Move the folder over to PSP/GAME (if they're not in a folder, create a folder with the game name and place those files inside of it. You should then be able to run the PS1 games 
You mean PS1 Crash games? If so, you can only get them in the format you've got now.