@echo off
cd /d "%~dp0"

setlocal enabledelayedexpansion

if "%~1"=="" (
    echo 请提供要加到文件名称之前的文字作为参数。
    exit /b 1
)

if "%~2"=="" (
    echo 请提供目录路径作为第二个参数。
    exit /b 1
)

set "prefix=%~1"
set "directory=%~2"
set "latest_file="
set "latest_time="

for %%F in ("%directory%\*") do (
    set "file=%%F"
    for %%I in ("%%~tF") do set "file_time=%%I"
    
    if not defined latest_time set "latest_time=!file_time!" & set "latest_file=!file!"
    if !file_time! gtr !latest_time! set "latest_time=!file_time!" & set "latest_file=!file!"
)

if not defined latest_file (
    echo 当前目录下没有找到任何文件。
    endlocal
    pause
    exit /b 1
)

for %%A in ("%latest_file%") do set "file_name=%%~nxA"

ren !latest_file! !prefix!!file_name!

endlocal