Hi Phil,
It appears your document is an OpenOffice speadsheet. (http://filext.com/file-extension/ODS)
Take a look at the Wikipedia page for OpenDocument and scroll down to the Application Support Section.
http://en.wikipedia.org/wiki/OpenDocument
You should be able to find links for software to open and view the file.
Let me know how you get on.
Andrew Hill, December 2008
