@echo off
set n=%cd%
:aaa
if not "%n:\=%"=="%n%" set "n=%n:*\=%" & goto aaa
for /f "delims=" %%a in ('dir /a-d /b *.*') do ren "%%a" "%n%_%%a"
pause & exit
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@echo off
pushd "d:\test\"
for /f "delims=" %%a in ('dir /a-d /b /s *.*') do (
    for %%b in ("%%a\..") do echo,ren "%%a" "%%~nxb_%%~nxa"
)
pause
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@echo off
pushd "d:\test"
for /r /d %%a in (*) do (
    for %%b in ("%%a\*") do ren "%%b" "%%~nxa%%~nxb"
)
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