What does the expand=yes line in autoexec.bat mean? - China DOS Union Forum

When making a boot disk, the first part of autoexec.bat is:
@ECHO OFF
set EXPAND=YES
SET DIRCMD=/O:N
set LglDrv=27 * 26 Z 25 Y 24 X 23 W 22 V 21 U 20 T 19 S 18 R 17 Q 16 P 15
set LglDrv=%LglDrv% O 14 N 13 M 12 L 11 K 10 J 9 I 8 H 7 G 6 F 5 E 4 D 3 C
cls
call setramd.bat %LglDrv%
set temp=c:\
set tmp=c:\
path=%RAMD%:\;a:\;%CDROM%:\
copy command.com %RAMD%:\ > NUL
set comspec=%RAMD%:\command.com
copy extract.exe %RAMD%:\ > NUL
copy readme.txt %RAMD%:\ > NUL
But I don't know what expand=yes means. Hope some friend can point it out! Many thanks.

Floor1　caihengze	Posted 2003-10-21 00:00
初级用户　Posts 1　Credits 105
When making a boot disk, the first part of autoexec.bat is: @ECHO OFF set EXPAND=YES SET DIRCMD=/O:N set LglDrv=27 * 26 Z 25 Y 24 X 23 W 22 V 21 U 20 T 19 S 18 R 17 Q 16 P 15 set LglDrv=%LglDrv% O 14 N 13 M 12 L 11 K 10 J 9 I 8 H 7 G 6 F 5 E 4 D 3 C cls call setramd.bat %LglDrv% set temp=c:\ set tmp=c:\ path=%RAMD%:\;a:\;%CDROM%:\ copy command.com %RAMD%:\ > NUL set comspec=%RAMD%:\command.com copy extract.exe %RAMD%:\ > NUL copy readme.txt %RAMD%:\ > NUL But I don't know what expand=yes means. Hope some friend can point it out! Many thanks.

Floor2　Wengier	Posted 2003-10-21 00:00
系统支持　Posts 10,521　Credits 27,736
These are all lines from some old boot disks, and they're already outdated, so it doesn't matter if you leave them out.

Floor3　Crackerhow	Posted 2004-04-24 00:00
初级用户　Posts 7　Credits 127
Brother OP: I'm puzzled by the same thing too. If you ever get it figured out someday, let little brother me know too. My QQ number is:78302055