Today a company e-mailed me a quotation with the extension: xls

I don't have Excel and eventually found Excel Viewer 2003. This took 45 mins
to download, and then didn't work. The Excel File Graphic had appeared atop
the quotation file - but when clicked on Excel Viewer 2003 opened and just
said: cannot open this file type.

Any ideas? Would appreciate solution. Running XP SP2 on a Dimension 8250..

Thanks