went

@echo off
for /f "tokens=2 delims==" %%i in ('type B.ini ^| findstr IDID=') do set "b=%%i"
for /f "delims=" %%i in (A.ini) do (
	if "%%i"=="[config3]" ( set "c3=1" ) else (
		if defined c3 if "%%i"=="id=%b%" set "found=1" & goto :done
		if "%%i"=="[config4]" goto :done
	)
)
:done
if defined found echo start "" "1.exe"
pause&exit
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