Something nice to look at...
On XP and Vista, you can preview XPS files using the XPS Viewer component that you can
download for free
from Microsoft's website.
We thought it would be nice to have previews in the NiXPS application too.
It took some work, but the result is going to be very nice. Take a look at a screenshot of the current development build. We hope to deliver this as part of the upcoming NiXPS v1.0 release.