The FAX can be sent as a TIF image,PDF or PS attached to an email. Most operating systems have a default viewer application installed to view TIF images. For PDF you would need a PDF viewer like Acrobat Reader and Foxit Reader, a smaller and faster reader here: http://www.foxitsoftware.com/pdf/rd_intro.php.
However if you are unable to view TIF files, click here to download a FREE TIF Image viewer (also view PDF): http://www.bravaviewer.com/downloadreader.htm