typedef enum
{
    FoExtTypeTransactionParams = 0,
    FoExtTypeDeviceObjectHint = 1,
    FoExtTypeIosbRange = 2,
    FoExtTypeGeneric = 3,
    FoExtTypeSfio = 4,
    FoExtTypeSymlink = 5,
    FoExtTypeOplockKey = 6,
    MaxFoExtTypes = 7
} FILE_OBJECT_EXTENSION_TYPE;