Overwrite existing workbook without prompting

My macro saves a workbook and overwrites an existing one. How can I stop the macro from asking if I want to replace the existing one?

Application.DisplayAlerts = false does not help, as the default answer is 'no' and doesn't overwrite the workbook.

What can I do?

Thanks.

Try so:

Sub Macro1()
   ExistFile = Dir(FileToSave)
   If ExistFile <> "" Then
      Kill FileToSave
   End If

   'Then save file    
   ThisWorkbook.SaveAs (FileToSave)
End Sub

Regards,
Antonio

Thanks Antonio, that's solved it perfectly!