@echo off & setlocal enableextensions
  for /f "tokens=*" %%f in ("C:\_D\TEST\My File 1.txt") do set myfile1_=%%~sf
  for /f "tokens=*" %%f in ("C:\_D\TEST\My File 2.txt") do set myfile2_=%%~sf
  CONCAT %myfile1_% %myfile2_% /B2
  endlocal & goto :EOF

  @echo off & setlocal enableextensions
  set myfile1_=C:\_D\TEST\My File 1.txt
  set myfile2_=C:\_D\TEST\My File 2.txt
  if not exist "%myfile1_%" (
    echo Exiting: File "%myfile1_%" not found
    goto :EOF)
  if not exist "%myfile2_%" (
    echo Exiting: File "%myfile2_%" not found
    goto :EOF)
  ::
  :: Build a Visual Basic Script
  set skip=
  set vbs_=%temp%\tmp$$$.vbs
  findstr "'%skip%VBS" "%~f0" > "%vbs_%"
  ::
  :: Run the VBS script with Microsoft Windows Script Host Version 5.6
  cscript //nologo "%vbs_%" "%myfile2_%" "%myfile1_%"
  ::
  :: Clean up
  for %%f in ("%vbs_%") do if exist "%%~f" del "%%~f"
  endlocal & goto :EOF
  '
  '................................................................
  'The Visual Basic Script
  '
  Const ForReading = 1, ForWriting = 2, ForAppending = 8 'VBS
  Dim fso, arg, f1, f2, line1, line2 'VBS
  Set fso = CreateObject("Scripting.FileSystemObject") 'VBS
  Set arg = WScript.Arguments 'VBS
  Set f1 = fso.OpenTextFile(arg(0), ForReading) 'VBS
  Set f2 = fso.OpenTextFile(arg(1), ForReading) 'VBS
  Do While (Not f1.AtEndOfStream) Or (Not f2.AtEndOfStream) 'VBS
    line1 = "     " 'VBS
    If Not f1.AtEndOfStream Then 'VBS
      line1 = f1.ReadLine 'VBS
    End If 'VBS
    line2 = "" 'VBS
    If Not f2.AtEndOfStream Then 'VBS
      line2 = f2.ReadLine 'VBS
    End If 'VBS
    WScript.Echo line1 & " " & line2 'VBS
  Loop 'VBS