У вашего броузера проблема в совместимости с HTML5
Steps To remove Known Password from an excel file
1. First of all open file which is protected by password.
2. Press [F10] Function Key to use menu bar.
3. Press [F] To Click On File Menu.
4. Press [A] To Use [SaveAs] Command.
5. Use Browse Button To Locate Excel File
6. Click on [Tools] PushUp Button
7. Choose [General Options..]
8. Press [Back space] To Remove Password.
9. Then – [OK] – [Save] – [Yes]