Demon

@echo off
pushd C:\
for /f %%i in ('dir /a:d /b ^| findstr "^[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]$"') do (
    pushd %%i
    for /d %%j in (*) do (
        pushd %%j
        rename *.txt %%i-%%j.txt
        popd
    )
    popd
)
pause
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