The Winbond MPU-401 Driver (WDM) is a Windows driver for a hardware component produced by Winbond Electronics, which is typically related to the MPU-401 MIDI interface. The MPU-401 is an industry-standard MIDI (Musical Instrument Digital Interface) interface used for communication between a computer and external MIDI devices such as synthesizers, keyboards, and other music equipment.

The WDM (Windows Driver Model) refers to the driver architecture used in Windows operating systems starting with Windows 98 and later versions. The WDM driver is responsible for enabling the communication between the operating system and the Winbond MPU-401 MIDI hardware, making it usable for music production or MIDI applications.