hfxiang

@echo off
Setlocal Enabledelayedexpansion
for /f "delims==" %%a in ('set _del_ID_ 2^>nul') do set "%%a="
for /f %%a in ('dir /b /a-d^|findstr /er "\.[0-9][0-9]*$"') do (
	set n=%%~xa
	set /a n=!n:~1!
	if defined _del_ID_%%~na (
		set /a n1=_del_ID_%%~na
		if !n! LSS !n1! ( set /a n1=n ) else ( set /a "_del_ID_%%~na=!n!" )
		del /f /q "%%~na.!n1!"
	) else (
		set /a "_del_ID_%%~na=!n!"
	)
)
endlocal
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