When faced with such unknowns, I would do as much upstream as possible. So I would then assign a CMYK device profile to the CMYK data and then convert it to sRGB - before going to XPS or the printer.
If you know what you are doing with your Windows CM settings, then perhaps setup assumed CMYK profiles to use for 4C input.
Stephen Marsh
Last edited by Stephen Marsh; 01-21-2012 at 02:13 AM.