First try opening Office Excel 2007 from the library computer. Then go to the Office button, Open Document and browse to find your document. Select it by clicking on it, Click Open.
Another way from an online guru is right click on the file name of your document from your flash drive or CD where you have it stored. Next rename it with the .xls extension.
Then ignore the warning about not being able to open it and save it with the new file extension.
