apang

@echo off
for /f "delims=" %%a in ('dir /a-d/on/b') do (
    if /i not "%%a"=="%~nx0" (
        set "Name=%%a" & set /a n+=1
        setlocal enabledelayedexpansion
        echo Ren "!Name!" "!n!%%~xa!"
        endlocal
    )
)
pause
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