An E-Mail Multimedia Keyboard for USB (64-bit) Windows driver is a software component that allows your computer to recognize and interact with the multimedia functions of your keyboard, specifically the E-Mail-related buttons or keys. These multimedia keys typically allow you to quickly open your email client, send emails, or perform other email-related tasks by pressing dedicated buttons on the keyboard.

The "64-bit" specification means the driver is designed for 64-bit versions of the Windows operating system (such as Windows 10 or Windows 11). The driver ensures that the multimedia keys on your keyboard work properly with your operating system.