77七

@echo off
for /f "delims=" %%a in ('powershell -c "'{0:yyyyMMdd_hhmmss}' -f (get-date)"') do (
	for /r "%~1" %%i in (*.doc?) do (
		set f=%%i
		set n=%%~nxi
		setlocal enabledelayedexpansion
		ren "!f!" "!n:~0,2!_%%a%%~xi"
		endlocal
	)
)
pause
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