Problem of: symbolic name and libusb32 file name

[skybird.cao]

First Problem:When I want to read/write a libusb32 device on windows. I write following code:
char  fileName[] = "\\\\.\\libusb0-001";
HANDLE fileHandle = CreateFile(fileName, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,    
                   OPEN_EXISTING,  FILE_FLAG_OVERLAPPED, NULL);

 /* retrieve device descriptor */
libusb_request req;
struct usb_device_descriptor descriptor;

req.descriptor.type = USB_DT_DEVICE;
req.descriptor.recipient = USB_RECIP_DEVICE;
req.descriptor.index = 0;
req.descriptor.language_id = 0;
req.timeout = IBUSB_DEFAULT_TIMEOUT;
               
ResetEvent(overLapped.hEvent);
DeviceIoControl( fileHandle, LIBUSB_IOCTL_GET_DESCRIPTOR, &req, sizeof(libusb_request),
        &descriptor, USB_DT_DEVICE_SIZE, NULL, &overLapped))

It is ok, CreateFile, DeviceIoControl work well.  But I got to know fileName can also be usb device symbolic file name. like:
"\\\\?\\USB#VID_DE24&PID_E910#6&282d7f15&0&3#{a5dcbf10-6530-11d2-901f-00c124fb951234}"
I use it as fileName.
CreateFile is ok, file handle is valid, but DeviceIoControl can't work, GetLastError is 1: ERROR_INVALID_FUNCTION,  I'm sure the symbolic name is the device: when I remove the device
CreateFile will failed.
Who can help me to explain it?

2. Second Problem, Why I can't use  SetupDiEnumDeviceInterfaces, microsoft recommand code to get
libusb32 device file path. Libusb32 has not device interface GUID?

Thanks
 

[skybird.cao]

I find the problem is on WIN7,  on winXP it is ok.