Select Compatibility Report in the View menu then click the Check Document
button on the Compatibility Report palette in the Toolbox.
However, I believe you may be under a misconception
A Compatibility
Report isn't generated when you Open a file. It's intended to determine
whether any changes you make in the file are likely to be incompatible with
the file format you're saving in. I.E., if you open an Excel 97-2004 (.xls)
workbook& create a Chart or other SmartArt object the Compatibility Check
will warn you that the content will be converted if you continue to save in
that same (.xls) format.
HTH |:>)
Bob Jones
[MVP] Office:Mac