Sub DarFormatoExelsEnFolder()
'Revisar todos los archivos xlsx en una carpeta y aplicar formato
definido

Dim wb As Workbook
Dim myPath As String
Dim myFile As String
Dim myExtension As String
Dim FldrPicker As FileDialog

'Optimizar Macro
  Application.ScreenUpdating = False
  Application.EnableEvents = False
  Application.Calculation = xlCalculationManual

'Definir carpeta destino
  Set FldrPicker = Application.FileDialog(msoFileDialogFolderPicker)

    With FldrPicker
      .Title = "Select A Target Folder"
      .AllowMultiSelect = False
        If .Show <> -1 Then GoTo NextCode
        myPath = .SelectedItems(1) & ""
    End With

'Si es cancelado
NextCode:
  myPath = myPath
  If myPath = "" Then GoTo ResetSettings

'Definir extensiones a dar formato
  myExtension = "*.xlsx*"

'Definir ruta y extensión
  myFile = Dir(myPath & myExtension)

'Revisar todos los archivos en la carpeta
  Do While myFile <> ""
    'Variable de libro abierto
      Set wb = Workbooks.Open(Filename:=myPath & myFile)

    'Confirmación de libro abierto
      DoEvents

    'Cambios al Workbook

WorkSheetChange

     'Guardar y cerrar Workbook actual
  wb.Close SaveChanges:=True

    'Confirmación de libro cerrado
      DoEvents

    'Proximo libro
      myFile = Dir
  Loop

'Aviso de fin de ejecución
  MsgBox "Operación Completada"

ResetSettings:
  'Normalizar excel
    Application.EnableEvents = True
    Application.Calculation = xlCalculationAutomatic
    Application.ScreenUpdating = True

End Sub

Sub WorkSheetChange00()
Dim WS As Worksheet

For Each WS In ThisWorkbook.Worksheets

    Format

Next WS

End Sub

Sub Format()

    'Format certain cells

End Sub