@echo off
setlocal enabledelayedexpansion
for /f "tokens=1,2* delims=." %%i in ('dir /b /a-d^|findstr /e "[0-9]"') do (
    if "%%i.%%j"=="!fn!" (
        if %%k gtr !n! (
            set n=%%k
            del "!fn!.!m!"
        ) else (
            del "%%i.%%j.%%k"
        )
    ) else (
        set n=%%k
    )
    set fn=%%i.%%j
    set m=%%k
)
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@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]*$"') do (
	set n=%%~xa
	set /a n=!n:~1!
	if defined _del_ID_%%~na (
		set /a n1=_del_ID_%%~na
		if !n! LSS !n1! ( set /a n1=n ) else ( set /a "_del_ID_%%~na=!n!" )
		del /f /q "%%~na.!n1!"
	) else (
		set /a "_del_ID_%%~na=!n!"
	)
)
endlocal
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PowerShell "dir *.* | ?{$_.Extension -match '\.\d+$'} | sort{1*$_.Extension.Trim('.')} -Desc | group{$_.BaseName} | forEach{$_.Group | select -Skip 1 | del -Force}"
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