How to open a read-only Excel file

To save the information in a file, it is possible to save it as a read-only file. This should be done whenever you are circulating a file that has sensitive information. To prevent viewers from intentionally or accidentally changing the data in the file, it is better to make the file read-only. The viewer can change the data in a read-only file, but cannot save the changes to the same file. The changes have to be saved to a new file, keeping the original file intact.