The main static company logo, the visual named "logo" is (as far as I know) embedded directly into the player software and the only way to replace it is to hack the player binary. I do not recommend doing this.

Some of the other visual graphics (Image Pan, TuxMuch, TuxTooMuch, and Tubular) can be edited with a program called RAWerter, available in another thread on this board.
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Tony Fabris