77七

@echo off
chcp 65001 >nul
cd /d "%~dp0"
(for /f "delims=" %%x in ('dir /b /a-d *.txt ^|find /v "out.txt"') do (
	for /f "useback tokens=1-12" %%a in ("%%x") do (
		if /i "%%a%%b%%c" equ "excludingmasscoefficients" (
			set m=1
		) else if defined m (
			if /i "%%a%%b%%c" equ "MAINST.K" (
				set /p="%%~nx	%%e	%%k"<nul
			) else if /i "%%a%%b%%c" equ "MAIND.C" (
				echo=	%%e	%%k
				set m=
			)
		)
	)
))>"out.txt"
pause
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77七

3楼代码使用楼主提供的文件，我这里测试结果正确。
根据楼主最新需求，以目标固定在文本第5 294 296行为规律，再写一个。

@echo off
chcp 65001 >nul
cd /d "%~dp0"
(for /f "delims=" %%x in ('dir /b /s /a-d *.txt') do (
	if "%%~nxx" neq "out.txt" (
		for /f "tokens=1* delims=[]" %%a in ('find /n /v "" ^<"%%x" ^|findstr /rb "\[5\] \[294\] \[296\]"') do (
			if not defined str (
				call :1 %%b
			) else (
				call :2 "%%b"
			)
		)
		call echo %%str%%
		set str=
	)
))>out.txt
pause & exit

	:1
	set str=%*
	exit /b
	:2
	for %%c in (%~1) do (
		if "%%~xc" neq "" (
			call set str=%%str%%	%%~nxc
		)
	)
	exit /b
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