>>579 これでどうかな？
@echo off
chcp 20932
set s="%~1"
set "a=key = value"
set "b=[version]"
call :x > "%~2"
goto :eof
:x
for /f "delims=" %%i in ('findstr /n "^" %s%') do (
set c=%%i
setlocal enabledelayedexpansion
set d=!c:*:=!
if /i !d!==!b! echo.!a!
echo.!d!
endlocal)