Hi rbonelli,
I'm not sure, what kind of fill mode you're are searching for, but Xara Xtreme supports more fill modes than Illustrator and Inkscape (that's one of the problem, why a export routine needs to simulate some of Xara Xtreme's enhanced fill types while exporting into a PDF or AI file). The only feature, Xara Xtreme doesn't offer are Gradient Mesh Fills.
Regards,
Remi
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