best option would be to convert you 'word' or 'excel' files to PDF's then you can link straight to them and acrobat reader will automatically open so you can view the file (presuming most of the world has some form of adobe acrobat)
Also to link to a file outside tourweaver, make a add url button and in the href just put 'yourfile.pdf' and if the document is in the same folder as the tour then it will load straight away.
im trying to create a link from a hotspot which links to a .wmv file, but i can only link files of type .htm, .html and .mht. is it possible to link to a .wmv file?