I tried the option with the config file. That doesn't work, since Armory and Bitcoin Core are crashing without error message during start of Armory.

Maybe I made sth. wrong:
Do I have to write "D:\Blockchain" or "D:\Blockchain\blocks"?
Do I have to put this file into the directory of Armory or into the corresponding AppData folder from Windows?
Is it neccessary not having Bitcoin Core running while Armory runs?