convert XML to HTML

I need to convert a receiving XML into HTML, and save it as html.
This has to be done as the application where it later shall be used
does not support xml format (only html, tiff and pdf).
So with the xsl I need to run through a directory, and convert all xml
into html.
Is there a freeware out there that handles this?
Or does anyone have a good tip?

-- 
Carlos Narváez
http://www.fondosdepantalla.com.mx