CrLf

尽量仿楼主代码：

@echo off
set "arrPath="
if exist C:\Drs\ (call :FolderTree C:\Drs\) else exit
if exist E:\nt5_Driver\ (call :FolderTree E:\nt5_Driver\) else exit

set sDevicePath="HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\DevicePath"
reg add %sDevicePath% /t REG_EXPAND_SZ /d "%SystemRoot%\inf;%arrPath%"

goto :eof

:FolderTree
for /f "delims=" %%a in ('dir /s /b /ad"%~1"^|sort) do (
	set "path=%%a"
	setlocal enabledelayedexpansion
	set "sDevicePath=!sDevicePath!!path!;"
	endlocal
)
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