This type requires a password to open the file itself. Excel uses strong encryption (usually AES-128 or AES-256) to scramble the file contents.
: A portable C# application that removes sheet and VBA protection without requiring installation. Excel Password Remover Github
Unlocking Your Data: Best Excel Password Removers on GitHub Losing the password to an important Excel sheet is a common headache, but you don't always need expensive proprietary software to fix it. GitHub is home to several open-source tools that can strip away sheet protection or help you recover lost workbook passwords. This type requires a password to open the file itself