You can make Excel always open old spreadsheets in Protected View. Enable or disable Protected View using in-built setting, Group Policy, Registry.

How do I password-protect an Excel file on desktop? To password-protect an Excel file or Excel Workbook on your Windows 11/10 desktop, follow these steps: ...

One of the most notable additions to Microsoft's 2007 Office System was the Trust Center, which centralizes the security options in Word, Excel, Outlook, PowerPoint, and the other applications in ...