Playstation games

Hey is it possible to play downloaded ps files on the ds? If not, how do you use these files?
Thanks :)

No, it is not, the playstation is far more powerful than the DS, plus the games are too big. Our playstation ISOs are for chipped playstations, PSPs with custom firmware or playstation emulators on PC.

Where can I save the PSP file?
I'm trying to understand how this works, but it is hard.

There are no PSP files, we host PSX isos, these need to be converted using a program to EBOOT.PBP, they can then be played on a custom firmware PSP.