You dont see them because there is no support for MPEG files in the firmware(anymore?), Pioneer have removed it! Dont ask why, because I dont know!
You have to write to Pioneer and tell them to put it back!
Just when I narrowed down to this player.
My current LG LDA-531 has the exact chipset but with a SD card slot which is near useless for viewing jpeg only.
By the way, slight off topic, which sd dvd player has zoom increments of 0.1, 0.2, 0.3....instead of LG's 2x, 4x, 64x !!!??? Who the eff would use 64x???