PSX ROMs on R4-2

I have downloaded two PSX Roms from this site for my R4-2, neither of them seem to be in a format that the R4 can run. I've tried using eXPSe from the R4, as well.The PSX Roms for Final Fantasy Tactics and Ogre Battle: March of the Black Queen did not have ISO's, is there a converter I have to run? When attempting to run them from the R4, I get the message "the files are a type that cannot be used", or something to that effect.Thank you for any help.

You cannot run PSX games on a DS and/or flashcart whatsoever.