Not sure it that has been around for a long time. And this thread was started in 2008. It seems to me this is the one that used to be included http://avbros.com/pagecurl/

It is probably compatible with Photo & Graphic Designer. Download the free demo and see if it works before you purchase it.

I am not sure but I think the filter gets installed in the Xara Picture Editor > PSplug-ins folder which is in the Program Files > Xara > Photo&GraphicDesigner folder.