Version 1: (File size minus two, (E107' 2'...))

GOTO 0   Removes the last two bytes from a file named ABC.
  RCX
  1
  Q
           E100'RCX'D A
           W
           Q
                      E100' H'
                      E107' 2'D A'Q'D A
                      RCX
                      D
                      W
                      Q
: 0
  If not exist %0 %0.bat
  DEBUG ABC <%0 | FIND "CX " | FIND /V "^" > %TMP%.\#
  FIND "                      " < %0 | DEBUG %TMP%.\#
  DEBUG < %TMP%.\# | FIND /V "-"> %TMP%.\##
  FIND "           " < %0 | DEBUG %TMP%.\##
  FOR %%I IN (W Q) DO ECHO. %%I>> %TMP%.\##
  DEBUG ABC                     < %TMP%.\##
  DEL %TMP%.\#
  DEL %TMP%.\##


Ver 2: (alternative simple sub routine technique by a variable named Next)

@ GOTO 0
    L102
    E100''D''A
    W100
    Q1
: Debugs
  DEBUG %FILE% < %0 > NUL
FOR %%I IN (SET GoTo:%Next%) DO %%I Next=

: 0
@ ECHO OFF
  If not exist %0 %0.bat
  Set File=ABC
  REM Create File
  ECHO FirstName> %File%

  SET Next=1
  GoTo Debugs
: 1

  ECHO. LastName>>%File%

  ECHO.
  ECHO. Result:
  TYPE %File%
  ECHO.

DEL /P %FILE%
SET File=
PAUSE
CLS

Ver 3: (most similar the above ver 2 but with fewer lines)

@REM>> ABC
@ECHO EXIT|%COMSPEC% /KPROMPT L2$_E0 D A$_W0$_Q|DEBUG>NUL ABC

CLS
@ECHO. Removed prefixed CrLf.>> ABC
@TYPE ABC
PAUSE