I would like to find that out too. I am creating a new theme, and i want it at least translucent. Somewhere in windows style builder i've tried but it doesn't work
EDIT: I know where to edit it, i want it translucent though.
k1m0s here: Explorer & Shell > Explorer > Preview Pane > 1 > <1> -- Edit the image
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Also updated system specs, thanks to piriform speccy!