Sub aaaaa()
Application.ScreenUpdating = False
 Application.DisplayAlerts = False
 Application.Calculation = xlCalculationManual
 sousRépertoire = "Fichiers Retard Relance"
 [A2].CurrentRegion.Offset(1, 0).Clear
 Set maitre = ActiveWorkbook
 Repertoire = ThisWorkbook.Path
 nf = Dir(Repertoire & "\" & sousRépertoire & "\*.xls") ' premier fichier
Do While nf <> ""
 Workbooks.Open Filename:=Repertoire & "\" & sousRépertoire & "\" & nf
With ThisWorkbook.Sheets("Feuil1")
    derlig = .Range("A65000").End(xlUp).Row + 1
   .Range("A" & derlig) = DateSerial((Mid(Cells(1, 1), 18, 4)), (Mid(Cells(1, 1), 15, 2)), (Mid(Cells(1, 1), 12, 2)))
   .Range("B" & derlig) = Left([D7], InStr(1, [D7], " ") - 1)
   .Range("C" & derlig) = LTrim(Split([B3] & " ")(0))
   .Range("D" & derlig) = Application.Sum(Range("j1").EntireColumn) / 2
End With
 ActiveWorkbook.Close False
nf = Dir ' fichier suivant
 Loop
 Application.Calculation = xlCalculationAutomatic
ActiveWorkbook.RefreshAll
Application.ScreenUpdating = True
Application.DisplayAlerts = True
End Sub