Xara :: Vector Graphics For T-Shirt Printing

I want to get some designs I've done printed, the design are pretty simple block colors and shapes, Xara Xtreme 5 is brilliant for doing these designs. However the T-Shirt printers (spreadshirt) want to files a vectors graphics. This is what they say on the site

Transforming objects into curves
Transform all design elements and text into curves.

This is possible with Corel Draw: highlight the part of the design you want to convert. Click on 'set up' - 'transform into curves'.; You may run into a few problems when converting complex pixel graphics into curves. Try to convert as few individual objects and colors as possible. Note: vector graphics for plot printing can have up to three colors per design.

Check the minimum size of the object
After you've converted to curves, you'll have to check every element of the design to make sure that it has a minimum size of 1.5 mm. One trick for checking this: create a small circle with a diameter of 1.5 mm and lay it over the smallest parts of the design. If the area is smaller than the circle, it's too small for plot printing.

Save image as vector graphic
Unfortunately, you cannot just open a pixel graphic into a vector program and save it in a vector format (.eps.) This is not enough. You have to manually make sure the pixel graphic has been converted into curves.

Can I just export as an .eps and it'll work, or do I need to convert to editable shapes then export?