Password to open Excel workbooks

Software on this site can’t help you with the password to open documents, it removes the other passwords in Excel, not the password to open. But there are other solutions:

Check out Excel Key.
If the file is the new Excel format (.xlsx/.xlsm) password removal cannot be guaranteed as Excel now uses strong 128-bit AES protection.
If the password is short, simple or uses a limited set of characters, password removal is probable.
For .xls files password removal is guaranteed.

For old 97/2000/XP/2003-files (.xls) I can also recommend this one: Excel Password Recovery Lastic