A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Edie L,
You can set password to modify the workbook, or users can open them as read only. To do so, open the workbook, click File>Save As, choose more option as you can see in screenshot.
Then choose Tools>General Options, set password to modify for the workbook**,**and check read only recommended box. Click saveto save the workbook.
Users will get a prompt to enter password to modify the workbook, if they don’t have password, they can also open them as read only.
Hope these can help you.
Regards,
Clark