This mechanism is supported 'in-box' for Win8 and newer. Normally if the USB device supports Microsoft OS descriptors, then it will allow Windows to automatically install the WinUSB driver. Win7 ships with the correct 'winusb.sys' file, but is missing an updated '.inf' file that associates the driver with 'usb mscompwinusb' devices. If you created a USB device for which the operating system did not have a native class driver, you had to write a kernel-mode device driver for your device. In versions of Windows earlier than Windows XP with Service Pack 2 (SP2), all USB device drivers were required to operate in kernel mode. This section describes the generic WinUSB driver (Winusb.sys) and its user-mode component (Winusb.dll) provided by Microsoft for all USB devices.
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