[文本处理] 批处理sort命令排序问题，求大佬指教

dir -Recurse *.txt | rni -NewName {([int]$_.BaseName).ToString('D3')+$_.Extension}
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@echo off
chcp 65001 >nul
rem 批处理保存为utf-8编码格式
for /d %%d in (*) do (
	pushd "%%d"
	setlocal enabledelayedexpansion
	set n=0
	for /f "delims=" %%i in ('dir /b /a-d *.mp4') do (
		if %%~ni gtr !n! set n=%%~ni
	)
	(for /l %%l in (1,1,!n!) do (
		if exist "%%l.mp4" echo file '%%l.mp4'
	))>xxx.txt
	endlocal
	if exist xxx.txt if not exist "%~dp0%%~nxd.mp4" (
		ffmpeg.exe -f concat -safe 0 -i xxx.txt -c copy "%~dp0%%~nxd.mp4"
	)
	del xxx.txt 2>nul
	popd
)
pause
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