紧急求救~~！！！！关于修改文件问题

我的Autoexec.bat文件内容是：
                  @ECHO OFF
set EXPAND=YES
SET DIRCMD=/O:N
cls
set temp=c:\
set tmp=c:\
path=a:\

IF "%config%"=="NOCD" GOTO QUIT
LH MSCDEX.EXE /D:oemcd001 /L:D

echo.
IF "%config%"=="SETUP_CD" goto AUTOSETUP
GOTO QUIT

:AUTOSETUP
set CDROM=FOO23
FINDCD.EXE
if "%CDROM%"=="FOO23" goto NOCDROM
path=a:\;%CDROM%\
%CDROM%
cd \WIN98
echo.
OEMSETUP.EXE /K "/IE /NF"
goto QUIT

:NOCDROM
echo.
echo The Windows 98 Setup files were not found.
echo.

:QUIT

但教程叫我编辑"autoexec.bat，　如果你的"SETUP\WIN98SE\WIN98\"文件夹下有一个名为"oemsetup.exe"的安装文件，那么你就可以直接把autoexec.bat中的"EXT:"字段编辑成如下的样子：
:EXT
%RAMD%:\extract /y /e /l %RAMD%: ebd.cab > NUL
echo The diagnostic tools were successfully loaded to drive %RAMD%.
echo.
LH %ramd%:\MSCDEX.EXE /D:mscd001 /L:%CDROM%
echo.
cls
echo Now installing Windows 98 SE
echo.
echo Loading...
path=%RAMD%:\;a:\;%CDROM%:\SETUP\WIN98SE\WIN98\
OEMSETUP.EXE
echo.
GOTO QUIT

但我在我原来的autoexec.bat里面根本找不到"EXT:"字段，那我怎样修改啊？？