[文件操作] 【求助】一个cmd批处理还原备份的问题

@echo off
setlocal enabledelayedexpansion

:Main
cls
set num=0
for %%i in (*profilebackup*.rar) do (
	set /a num+=1
	set "File!num!=%%i"
	call echo   !num!. %%File!num!%%
)

if %num% equ 0 exit

if %num% gtr 0 (
	echo.&echo ______________________________________________ &echo.
	echo     把要恢复的备份文件拖拽到本窗口中
	echo     或者选择上述文件前面对应的数字
	echo     直接回车将选择列表中最后一个文件
	echo.
)

set "choice="
set /p "choice=    请选择："

if "%choice%"=="" (
	call :Recover
	exit
)

set /a "sum=%choice%+0" 2>nul
if "%sum%"=="%choice%" (
	if exist "!File%choice%!" (
		call :Recover
	) else (
		goto Main
	)
) else (
	echo "%choice:"=%"|findstr /i "^.[a-z]:\\.*\.rar.$">nul&&(
		call :Recover
		exit
	)
	goto Main
)
exit

:Recover
cls
taskkill /f /im firefox.exe 2>nul
rd /q /s profile.old 2>nul
ren profile profile.old 2>nul
md profile 2>nul
rar x -r "!File%choice%!" profile
cls
echo.&echo     是否重启FireFox.exe？
echo.
echo     是[Y]/否[直接回车]
echo.
set "choice="
set /p "choice=    请选择："
if /i "%choice%"=="y" (
	start "" "firefox.exe"
)
goto :eof
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