— If the password is known, Recovery for Excel application has the ability to...

— This question has already been tackled here.

— To unlock this file you need the password. In case that you lost the password...

— Yes, you can export a multi-sheet Excel file to CSV using the built-in menu...

— Any major version of Excel is able to save and export its files to old excel...

— There is an application called search and replace that allows you to perform...