@echo off

setlocal

set "target_folder=The10++"

set "search_root=C:\"

for /d /r "%search_root%" %%i in (*) do (

    if /i "%%~nxi"=="%target_folder%" (

        set "THE10++= "%%i""

goto :THE10++

    )

)

:THE10++

start "" %THE10++%