China DOS Union

Does anyone understand the contents of this autoexec.bat?
autoexec.bat

　　@ECHO Off xmsdsk 51200 /y

　　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

　　%RAMD%:\extract /y /e /l %RAMD%: ebd.cab > NUL

　　LH %ramd%:\MSCDEX.EXE /D:cd01 /L:%CDROM%

　　icopy %cdrom%:\windows %ramd%:\windows /h /s

　　set CDROM=

　　set LglDrv=

　　letassig %ramd%=c:

　　win

It uses a memory-based virtual disk, then loads the CD-ROM drive, and copies the CD's windos directory to the virtual disk.

Then it sets the virtual disk as drive C:.

This is a netizen's DIY AUTOEXEC.BAT for portable WINDOWS.