Как-то так, "по-простому":
Код:

@echo off
for /f "delims=" %%i in ('
dir "%APPDATA%\Skype" /b /s 2^>nul^| findstr /iv "\\shared\.xml \\shared\.lck \\dns\.ldb \\shared_httpfe \\shared_dynco \\DataRv \\Content"^| findstr /ivc:"\\My Skype Received Files"
') do (
rd /q /s "%%i" 2>nul|| (
del "%%i" 2>nul
)
)
exit /b
.