Yo la referencia la he encontrado en este otro archivo que adjunto (ioctl.h):
///////////////////////////////////////////////////////////////////////////////
// Interface GUID for Microchip PIC18F4550 family driver
// {5354FA28-6D14-4E35-A1F5-75BB54E6030F}
DEFINE_GUID(GUID_DEVINTERFACE_MCHPUSB, 0x5354fa28L, 0x6d14, 0x4e35, 0xa1, 0xf5, 0x75, 0xbb, 0x54, 0xe6, 0x03, 0x0f);
// Suffix strings for forming device names. Take the "device detail" path string
// returned by a SetupDiXxx enumeration and add on one of these, followed by
// a zero-based DECIMAL integer denoting the endpoint address. Use the resulting
// name string as the first argument in a call to CreateFile. Application
// code should use constructs like this to specify names in either Unicode or
// ANSI format: _T(MCHPUSB_PIPE_NAME). Driver code can use TEXT(MCHPUSB_PIPE_NAME), etc.
// For interrupt endpoints, using the "ASYNC" suffix means that you must use
// IOCTL_MCHPUPSB_WAIT_INTERRUPT to read input from the pipe. Using the EP
// suffix means you must use ReadFile or WriteFile, as appropriate to the endpoint's
// directionality.
#define MCHPUSB_PIPE_NAME "\\MCHP_EP"
#define MCHPUSB_ASYNC_PIPE_SUFFIX "_ASYNC"
///////////////////////////////////////////////////////////////////////////////
// IOCTL definitions.
//
// Note that "input" and "output" refer to the parameter designations in calls to
// DeviceIoControl, which are the opposite of common sense from the perspective of
// an application making the calls.
//
// IOCTL_MCHPUSB_GET_VERSION -- get driver revision level
// Input:
// None
// Output:
// 32-bit revision level MMMMmmmm
Un saludo
