mootjeuh has updates his Simple Image Viewer for the PlayStation Portable.

Changes:

Okay, today I added one interesting feature; a config file where you put int the startup directory of ASIV.
It’s by default set to ms0:/ you can change that manually to anything you want. So in theory, you could also browse your flash and/or umd disc.
I’ve also added compatibility for .PCX images.

http://forums.qj.net/psp-development-forum/163601-asiv-5-simple-image-viewer.html