A .bat created by grimmel - to be saved anywhere you want
In this .bat the folders are H:\MPC (SV7 files) and H:\SV8Temp\MPC (where the converted files will be). In line 5 edit "C:\MPC2SV8Path\" to where mpc2sv8.exe sits on your computer.
Save it as convert2sv8.bat or any name you want and run:
XCOPY /T H:\MPC H:\SV8Temp\MPC
for /R %%F IN (*.mpc) DO C:\MPC2SV8Path\mpc2sv8.exe "%%F" "H:\SV8Temp\%%~pF%%~nF.mpc"