if(sys.gvarfind('fso_is_set') = -1)
  gvar(fso_is_set)
  fvar(cur)
  cur = block.select(BLK_OBJ)
  println('Dim fso')
  println('Set fso = CreateObject("Scripting.FileSystemObject")')
  println('')
  block.select(BLK_NOTH)
  println('Set fso = Nothing')
  block.select(cur)
end