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Code: Select all

@echo off
set "replace=system"
set "replaced=offline"

set "source=control.reg"
set "target=control2.reg"

setlocal enableDelayedExpansion
(
for /F "tokens=1* delims=:" %%a in ('findstr /N "^" %source%') do (
set "line=%%b"
if defined line set "line=!line:%replace%=%replaced%!"
echo(!line!
)
) > %target%
endlocal

Code: Select all

@echo off
setlocal enableDelayedExpansion EnableExtensions

set "replace=system"
set "replaced=offline"

set sourceFolder=c:\temp
set mask=*.reg

for /f "delims=" %%F in ('dir /b /a-d "%sourceFolder%\%mask%"') do (
  (
    for /F "tokens=1* delims=]" %%a in ('find /N ^< "%sourceFolder%\%%F"') do (
      set "line=%%b"
      if defined line set "line=!line:%replace%=%replaced%!"
      echo.!line!
    )
  ) > "%sourceFolder%\%%~nF_2%%~xF"
)