After asking like 3-4 times, it seems no one on this forum, not even the Developer, knows how to Dual Mine ETH + SMARTCash ( keccak ) on Windows.
Whatever you do or try, Authentication failed, even if the username and password are 100% valid.
Really Really poor community !
If the developper or the community don't ask swiftly to your questions you accuse everyone of being a poor community? I'd say you are a poor guy!