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Save in 97-2003 Format
If you save your Excel files in 97-2003 format (.xls instead of the new .xlsx format) users who do not have Excel 2007 or later installed on their computer can still open your Excel files.
1. Open a workbook.
2. On the File tab click Save As.
3. Select Excel 97-2003 Workbook (*.xls) from the drop-down list.
4. Click Save.
To automatically save your Excel files in 97-2003 format execute the following steps.
5. On the File tab click Options
6. On the left side click Save and select Excel 97-2003 Workbook from the drop-down list.
7. Click OK.
Note: Excel will always give you a warning if features are not supported in 97-2003 format so you can save the file in the new .xlsx format (Excel Workbook).