77七

@echo off
(for /f "useback delims=" %%x in ("D:\DATA\1.txt") do (
	setlocal
	call :1 "%%x"
	endlocal
))>"D:\DATA\2.txt"
pause & exit

	:1
	for /f "tokens=1* delims==" %%a in ("%~1") do (
		set str=%str%%%a=%m%
		if "%%b" neq "" (
			if defined m (
				set m=
			) else (
				set m==
			)
			call :1 "%%b"
		) else (
			echo %str%%%a
			exit /b
		)
	)
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