I have allready tried this download and it works well on my Windows 98 Operating system. It is needed for The Astral Dynamics Workbook. You don't have to have Excel to use it!
Microsoft Excel Viewer is a small, freely distributable program that lets users view and print Excel for Windows (versions 2.0 and greater) and Microsoft Excel for the Macintosh (versions 2.2a and greater) spreadsheet files.
Go to http://office.microsoft.com/downloads/default.aspx?Product=Excel&Version=95|97|98|2000|2002&Type=Viewer