SuperTuxKart help

I'm working on SuperTuxKart Portable (yes, PieterK is happy). To save space, I want the unTGZ plugin to extract the models and images folders (they're the biggest). But apparently it won't show any pics. I don't know if it's because it's extracting to the wrong directory, or anything else. My work so far is at:
http://nascent-project.org/digitxp/SuperTuxKartPortable.exe (or at least it should be)
Thanks!