yhcfsr

@echo off&setlocal 

cd/d "d:\1W本小说"

for /r /d %%a in (*) do call :lp "%%a"
endlocal&pause&goto:eof

:lp
setlocal
pushd "%~1"
dir|find "1 个文件">nul||(goto:end)
for /f "delims=" %%a in ("%~1") do set "name=%%~nxa"
for /f "delims=" %%a in ('dir /a-d/b') do ren "%%a" "%name%%%~xa"
:end
popd
endlocal&goto:eof
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