[greg zakharov]

Код:

@echo off
  setlocal enabledelayedexpansion
    set "i=0"
    for %%i in (%*) do set /a "i+=1"
    if "%i%" neq "1" echo:Index is out of range.&goto:eof
    
    for /f "skip=1 tokens=1" %%i in (
      'dir /a-d /t:c %1 ^| findstr /rc:"\."'
    ) do (
      set "itm=%%~i"
      set "itm=!itm:.=!"
      if "!itm!" equ "%date:.=%" set "chk=true"
    )
    if not defined chk echo:WARNING: lost file.
  endlocal
exit /b