The "0901" designation refers to a specific version of the TAP-Windows driver architecture, which became the stable standard around 2009.
TAP (Network TAP) devices are virtual Ethernet adapters that operate at Layer 2. The tap0901 variant is specifically the Windows kernel-mode driver created by the OpenVPN project. Its primary job is to bridge user-space VPN applications with the kernel’s networking stack, allowing raw IP packets to be injected and read as if they came from a real physical NIC. tap0901 driver windows 10 64 bit