Solution 1:

If you have a gmail account it will open and display XPS documents. Also there is an XPS-Reader application on the Mac app store.

Solution 2:

If you use Homebrew and like the command line then try this:

  1. open terminal (cmd+space and write terminal)
  2. brew install libgxps
  3. xpstopdf file.xps file.pdf
  4. open file.pdf

You will see the converted PDF in the preview.app ... i hope so :)

Solution 3:

With MacPorts:

sudo port install mupdf
mutool convert -o output_file.pdf input_file.xps