Delete all files in a directory except the n newest on Windows

delete_except_newest.bat

:: ****************************************************************************
:: Delete all files except the n newest
:: ****************************************************************************
:: ----------------------------------------------------------------------------
:: Usage: delete_except_newest.bat DIR N FILTER
:: Example: delete_except_newest.bat C:\tmp 10 *.txt
:: ----------------------------------------------------------------------------
:: ****************************************************************************

:: ****************************************************************************
:: Init
REM CLS
@ECHO off
SetLocal EnableDelayedExpansion
:: ****************************************************************************

@ECHO.

:: ****************************************************************************
:: Variables 
:: ****************************************************************************

SET DIR=%1%
SET /a N=%2%
SET FILTER=%3%

:: ****************************************************************************
REM list all filenames, except directories, sorted by date of creation, newest first
for /F "skip=%N% tokens=*" %%G in ('dir /T:C /O:-D /B /A:-D "%DIR%\%FILTER%"') DO DEL "%DIR%\%%G
@ECHO Program exited successfully.
:: ****************************************************************************