How to find hidden text
 

I ran a findstr command from a dos prompt and it finds the word "proprietary"
in an Excel file.

When I open the Excel file and use Edit | Find it does not find
"proprietary" anywhere (even if I choose Within Workbook Look in Formulas,
Values, Comments). I have looked in the header and footer. Any idea where I
can find the word "proprietary" in this Excel file?

Many thanks for your help,
Judy