To view XPS files you might have to downalod Microsoft XPS Essential Pack. The problem that I was facing on Windows XP pc, each time I would double click xps file, it would opoen a new broswer window and popup a dialog “Save your xps file”. I noted that I indeed was using XPSViwer.exe. After isntalling the above pack, it add a second option called “XPS Viewer EP”. Use that option. I have highlighted in the image below. Right click on the file and choose open with (if open with does not appear, hold shif key down and right click)
XPSViewer.exe does no work. For some reason it tries to pen it in Firefox and firefox than give you a dialog, do you want to save. I can never open it. You can easily view the file with XPS Viewer EP program.