WinUsb

Microsoft provides a set of proprietary device classes and USB descriptors, which are called Microsoft OS Descriptors (MODs). When a new device is attached to a computer for the first time, an operating system that supports Microsoft OS Descriptors will request the string descriptor that is at index 0xEE. The Microsoft OS String Descriptor contains an embedded signature field that the operating system uses to differentiate it from other strings that might be at index 0xEE. The presence of a string descriptor that contains the proper signature field at index 0xEE indicates to the operating system that the device supports Microsoft OS Descriptors. The Microsoft OS String Descriptor also provides the operating system with version information.
The operating system queries for the string descriptor at index 0xEE during device enumeration--before the driver for the device has loaded--which might cause some devices to malfunction. Such devices are not supported by versions of the Windows operating system that support Microsoft OS Descriptors.