77七

@echo off
set n=-1
(for /f "useback tokens=1* delims=[]" %%a in (`find /n /v "" ^<"1.txt"`) do (
	set "str=%%b"
	setlocal enabledelayedexpansion
	if "!str!" neq "" (
		if "!str!" neq "!str:*.bat=!" (
			if "!str:*.bat=!" neq "" (
				set "str2=!str:*.bat=!"
				if "!str2!" neq "!str2:.bat=!" (
					call :1
				)
			)
		)
	)
	if !n! equ -1 (
		echo=!str!
	)
	endlocal
))>2.txt
pause & exit

	:1
	set /a k=(n+=1)+4
	if "!str:~%n%,4!" equ ".bat" (
		if defined m (
			echo !str:~0,%k%!123!str:~%k%!
			exit /b
		) else (
			set /a n+=3,m=1
		)
	)
	goto :1
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