WHY

test.bat

@if (0)==(0) echo off
for /f "delims=" %%i in ('dir /b /a-d^|cscript //nologo //e:jscript "%~f0"') do ren %%i
pause & exit
@end

var arr = WSH.StdIn.ReadAll().split('\r\n');
var reg = /^((\d+\.)+\d+)([^《》]+?)(\.[^.]+)?$/;
for(var i in arr){
    if(reg.test(arr[i])) WSH.Echo(arr[i].replace(reg, '"$&" "$1《$3》$4"'));
}
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WHY

test.ps1
右键使用PowerShell运行

dir | foreach-Object{
    if($_ -is [System.IO.FileInfo]){
        $name = $_.name -replace '^((\d+\.)+\d+)([^《》]+?)(\.[^.]+)?$', '$1《$3》$4'
        ren -Path $_.Get_FullName() -NewName $name
    }
}
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WHY

@echo off & setlocal enabledelayedexpansion
for /f "delims=" %%i in ('dir /b /a-d') do (
    for /f "tokens=*delims=0123456789." %%j in ("%%i") do (
        if not "%%i" == "%%j" (
            set "s=%%i"
            echo "%%i" "!s:%%j=!《%%~nj》%%~xj"
        )
    )
)
pause
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