I dont see why not. Just add an active x control. I use explorer then its easy to navigate to other docs. I have posted our operations manual this way although it is pdf.
active x control with a window script that looks like this:
screen_name="Manuals";
#Explorer1.Navigate("c:\wwdocs\Operational Manual 8_17_4.pdf");
This points the active x control (explorer) to a pdf file. we can point it to an xls file just the same.
hope this helps