apang

@echo off
for /f "tokens=1* delims=:" %%a in ('findstr /n .* a.txt') do set "_%%a=%%b"
for /f "tokens=1* delims=:" %%a in ('dir /a-d /b *.jpg^|findstr /n .*') do (
  set "Name=%%b"
  setlocal enabledelayedexpansion
  if defined _%%a echo,Ren "!Name!" "!_%%a!.jpg"
  endlocal
)
pause
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