If you have sensitive data you'd like to keep from prying eyes in a Microsoft Excel file, the easiest way to protect it is with Excel's built-in password tools.

Go to File > Options > Trust Center > Trust Center Settings > Protect View. Next, uncheck the box next to Enable Protected View for files located in potentially unsafe locations.

How to fix this file type that is not supported in Protected View Excel? If the file type is not supported in Protected View in Office Excel, disable the Protected View settings.

A recommended approach to secure your most private documents — whether it’s a PDF, Word file, or Excel spreadsheet — is to lock them with a passcode. While this does help keep sensitive ...