Or, a bit more efficiently:

Const csFILEPATH As String = _
"S:\Stardex Compliance\Registers\Stardex Breach Register.xls"
Dim rSource As Range

With ActiveWorkbook.Worksheets("Register")
Set rSource = .Cells(.Rows.Count, 1).End(xlUp)
End With
With Workbooks.Open(csFILEPATH)
With .Sheets("Register")
rSource.EntireRow.Copy _
Destination:=.Cells(.Rows.Count, 1).End(xlUp).Offset(1, 0)
End With
.Close SaveChanges:=True
End With

In article ,
JE McGimpsey wrote:

One way:

Const csFILEPATH As String = _
"S:\Stardex Compliance\Registers\Stardex Breach Register.xls"
Dim wbDest As Workbook
Dim rDest As Range
Dim rSource As Range

With ActiveWorkbook.Worksheets("Register")
Set rSource = .Cells(.Rows.Count, 1).End(xlUp)
End With
Set wbDest = Workbooks.Open(csFILEPATH)
With wbDest.Sheets("Register")
rSource.EntireRow.Copy _
Destination:=.Cells(.Rows.Count, 1).End(xlUp).Offset(1, 0)
End With
wbDest.Close SaveChanges:=True