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Open your file in excel2007 then, Press F12 then Click on Save as type, Dropdown list appear, Chose Excel97-2003 workbook.
in ms-office2007, Click of office button and save as excel97-2003
Open the file that you want to convert, and click File(Round Office Orb button) and move your pointer toSave As, and from the list of options select Excel97-2003 Workbook.
You can convert it in2 ways.
1. Open file and then Click office button and select Save As and same file with "Microsoft Excel97 and2003"
OR
2. Convert it online by searching sites on google.com.
Simply click file>option>save> chose "Excel97-2003 Workbook" from Save files in this format dropdown list then all your files will be97-2003 format of Excel