Excel Viewer 2003 + Service Pack
Interestingly, Excel Viewer 2003 also supports Microsoft Office Excel 2007 document (.xlsx) or even Microsoft Office Excel 2007 macro-enabled document (.xlsm).
When you download the viewer package, you get the “xlviewer.exe” file (9.9 MB), which you’ll need to run to install Excel Viewer 2003. However, you have to remember to install all High Priority Updates (Service Pack) from Microsoft Updates after installing the Excel Viewer 2003. Just search for ‘Excel Viewer 2003 Service Pack’ and you’ll get it.