How do I access the filesystem information for a GPT formatted disk partition/GUID volume?

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C++/CLI

Windows

I am able to obtain the filesystem for partitions on standard MBR disks. However I am hitting a brick wall trying to obtain the filesystem on a GPT-style partitioning scheme. To-date I can obtain the volume information (from a little C++ CLI test app - compiled with VS2010):

[1] GPT entry:
        partition number (2)
        partition name: Basic data partition
        partition Type GUID: {EBD0A0A2-B9E5-4433-87C0-68B6B72699C7}
        partition GUID ID: {AF359AFD-C400-419A-A0DF-6E0E084A548E}

ERROR: Cannot access volume '\\?\Volume{AF359AFD-C400-419A-A0DF-6E0E084A548E}' filesystem information. Have you specified a valid volume GUID? [DeviceIoControl() error: 1]

The above partition is standard 2Tb NTFS partition on a 2Tb harddisk (entry 1 is obviously the system reserved GPT table). I can obtain a handle to the Volume correctly (using the CreateFile() function). However when I call the DeviceIoControl(hVolume, FSCTL_QUERY_FILE_SYSTEM_RECOGNITION, ...) function it returns an invalid function error??

Does the FSCTL_QUERY_FILE_SYSTEM_RECOGNITION call work for GPT formatted harddisks? If not how do I obtain the filesystem information for a given GUID volume code?

Thanks
Bob