hi.
i have problem with plt file in corel draw, i have changed my windows from xp to 7 and this problem has appeared. in windows xp i dont have any problem with corel draw.
when I make a curve in corel draw for example a circle and export it (select object and then ctrl+E) and then import it to my laser software or import in its own corel draw the curve become destroy and convert to a polygon. it is more apear in small size of object. perhaps it's more bold in small size. in the following picture i have show an example:
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