Binance users are receiving an email with an invitation to try out a new application for Windows for a reward of 0.5 BTC that will "be sent to their Binance account". All you need to do is download and enter your data.
WARNING This is phishing! The attackers try to obtain personal data in this way, to access your money. The Official Binance site will never give 0.5 BTC for testing Windows applications. Be careful. Be careful.