That is just a pure excel file hosted on the server, Internet Explorer opens it up directly in the webbrowser. Since I do not use IE, I load another program up to view it.
As for drivers. The first half of my college career I was a graphics design major, so I have a full sweet of graphics design software, and when you buy the creative suite from adobe, you get Acrobat professional, which comes with the printers-to-pdf drivers. They are alot more robust and feature rich, and is what I use. You can edit the PDFs and all kinds of fancy stuff. I just know other alternatives exist.
A quick search turned up this one:
http://www.cutepdf.com/I make no claim on if it has/does not contain spyware or virus, so as always when downloading something you are unsure, check afterwards.