DOCBOOK-APPS: Long-shot: XSL FO printer driver?

Apologies as this is a bit off topic – but a lot of people here seem to 
be using lots of different products and have knowledge in this area...

So, does anyone know of a printer driver (for Windows) that outputs to an 
XSL:FO file? If this doesn't exist yet, it should, because it would make 
producing PS and PDF output from any Windows app for free a breeze! Of 
course, maybe it would be a little hard to do.

Best wishes,
Marc