How do you modify a ‘read-only’ Excel file? There are multiple ways to undo the read-only mode and enable editing of the file content. If you want to learn how to turn off Read-only in Excel, simple Excel hacks, please visit the free Excel online course.īut sometimes, you are required to change the contents of a ‘read-only’ file. Here, the read-only mode proves quite effective as the file content stays unchangeable yet viewable by the other parties. Either you intend to prevent data removal by someone else or wish to ensure that the content remains the same while being passed to several persons. You often keep your Excel worksheet as a ‘read-only’ file for security reasons. Unlocking a ‘Read-Only’ Excel File on Windows PC.