By default you can open an XPS file in Windows Vista using Microsoft’s XPS Viewer which is already installed by default. You can also open it in Internet Explorer because it makes use of XPS plug-in. If you are using any other version of Windows OS except Vista, then grab the XPS Viewer now.
But most people are not satisfied with XPS documents and want to convert it to PDF format so that it can be easily distributed. For conversion, open the XPS document in Internet Explorer and then *** Print. Now use BullZip Printer from the list of printers and *** Print. For full guide along with download link, go here. Enjoy!