Tente encontrar e substituir o valor no arquivo:
Dim CellContent as String
Dim NewCellContent as String
CellContent = 'the line you're bringing in
NewCellContent = (Worksheetfunction.Substitute([your line], chr(26),vbnullstring))
Do Until CellContent = NewCellContent
CellContent = NewCellContent
NewCellContent = Worksheetfunction.Substitute(NewCellContent,chr(26),vbnullstring)
Loop
Ou você pode usar o regex.