You can always check password details in the ReadMe.doc.
Do you have Assisted Payroll?
If you have Assisted payroll, you may get the following error message after restoring the file:
This QuickBooks file may be missing some of the payroll data that you have already sent to the Payroll Service.
Resolve this issue before creating any new transactions:
To restore the missing data, select Send Payroll Data from the Employees menu.
Note: Select Send if the Items in the Send field contains 0 Paychecks for $0.00. If there are transactions listed, you may send duplicate transactions to the payroll service. Contact payroll support to check what items have already been sent."