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[pelago]

You can only have one mxm_ss.* file in the game root. I don't know the order of precedence, but it would seem from your results that the wmv file takes precedence over jpg or png.

I'm not sure if there is an automatic filename for coverart (like mxm_coverart.jpg) that is picked up by autodir, but you can drop a mxm_entry.xml into each game folder with entries pointing to the coverart you want.