Por exemplo aqui
Public ModObjfso As FileSystemObject
Public ModObjFolderOrigem
Public ModObjfile
Public str_LinhaArq as string
Public strPasta as string
Busca todos os ret.xml da pasta , abre e fecha
strSubPasta = "C:Pasta"
Set ModObjFolderOrigem = ModObjfso.GetFolder(strSubPasta)
For Each ModObjfile In ModObjFolderOrigem.Files
If ((LCase(Right(ModObjfile.Path, 7))) = "ret.xml") Then
Open ModObjfile.Path For Input As #4
Line Input #4, str_LinhaArq
Close #4
End If
Next
Next