When you say get into a worksheet if you mean unprotect a protected sheet to
allow you to edit it then that's achievable using the code here

http://www.mcgimpsey.com/excel/removepwords.html

If you mean open a workbook then that's a lot more awkward and you'll
probably need to buy software or refer the workbook to one of the many
companies ho provide a password removal service.

Mike

Hi,

Obviously that defeats the purpose of a password.

However, You can buy a password cracking program on the internet.