If you wish to edit or make changes to the Excel file, you can disable or remove Read-only attribute by following any one of these methods.

How to Disable Read-Only in Excel. Although most Excel documents are saved so that they can be edited by anyone who opens the document, others may be saved as "read-only" so that they cannot be ...

Protected and unprotected cells look the same in a spreadsheet. To delete all unprotected cells, you must select all of them at once, which can be easily done by using the Find and Replace feature.

You can add or remove a password from your Excel spreadsheets through the File tab. You'll do it slightly differently on a Mac and PC.