When you open a workbook in Excel, it will open as read-only by default if the file is located in a read-only location or if the workbook is protected by a password. You can also open a workbook as read-only by using the Open dialog box or by using the keyboard shortcut CTRL + O. To open a workbook as read-only, do the following:
Click the File tab, and then click Open.
In the Open dialog box, locate the workbook that you want to open.
Click the workbook, and then click Open.
Click Read-Only in the message that appears.
If you try to save a read-only workbook, Excel will display a message asking if you want to save a copy of the workbook. If you click Yes, you can save the workbook with a new name or in a different location. If you click No, your changes will be discarded.
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