[文件操作] 【已解决】批处理批量改后缀名遇到同名文件名怎么办？

@echo off&setlocal enabledelayedexpansion
set n=0
for /f "delims=" %%i in ('dir/a-d/s/b/l/on "d:\2\*.*"') do (
 if !n! equ 0 (
  ren "%%i" "a.mp3"
  set/a "n+=1"
 ) else (
  ren "%%i" "a (!n!).mp3"
  set/a "n+=1"
 )
)
pause
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