Set up ghostscript PDL to convert xps to PDF

For 32 Bit:
Download binary e.g. ghostpdl-8.71-win32.zip http://www.ghostscript.com/releases/
unzip and find gswin32
command  gxps-871.exe -sDEVICE=pdfwrite -sOutputFile=33.pdf -dNOPAUSE tiger.xps

For 64 Bit

download ghostpdl-9.00.tar.gz  and get all the source
use VC++  nmake xps_msvc.mak to complike gxps.exe ( from 64 bit sdk prompt)
gxps -sDEVICE=pdfwrite -sOutputFile=77.pdf -sNOPAUSE tigger.xsp

CutePDF is a printer that convert any doc to PDF and can be programed in C#
(PopUp Dialog to save file). It uses ghostscript.
http://www.cutepdf.com/products/cutepdf/writer.asp