Does anyone know what an .rcc file is and how I can edit it? I opened it with a txt editor and it looks scrambled. .rcc seems to be the way GE 6 stores it's imagery data and I'm trying to figure out if I can skin GE 6 (in GE 4 it used plain old .jpg files).

In particular:
balloons.rcc
effects.rcc
leftpanel-common.rcc
leftpanel-layer.rcc
localshapes.rcc
navcontrols.rcc
renderui.rcc
search.rcc
toolbar.rcc