Public Sub PasteSignature()
Dim SigWB As Workbook
Set SigWB = Workbooks.Open("C:\Users\[username]\AppData\Roaming\Microsoft\Signatures\[sig file name].htm")
SigWB.Worksheets(1).UsedRange.Copy Cells(Cells(Rows.Count, 1).End(xlUp).Row + 1, "A")
SigWB.Close savechanges:=False
End Sub