Updating an Excel document via Access VBA

Why doesn't this code work?
Access 2013
Excel 2010

 Set objapp = CreateObject("Excel.Application")

            objapp.Visible = True
            Set wb = objapp.Workbooks.Open("c:\test.xlsx", True, False)
               objapp.Range("A1").Cells.Replace What:="123", Replacement:="456", LookAt:=xlPart, _SearchOrder:=xlByRows, MatchCase:=False
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You need to specify which Sheet in the Workbook.  Try this:

    Set objapp = CreateObject("Excel.Application")
    objapp.Visible = True
    Set wb = objapp.Workbooks.Open("C:\test.xlsx", True, False)
    Set wbSht = wb.Sheets(1)
    wbSht.Range("A1").Replace What:="123", Replacement:="456"

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Microsoft Access

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