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//0x4 bytes (sizeof)
enum _FILE_OBJECT_EXTENSION_TYPE
{
    FoExtTypeTransactionParams = 0,
    FoExtTypeDeviceObjectHint = 1,
    FoExtTypeIosbRange = 2,
    FoExtTypeGeneric = 3,
    FoExtTypeSfio = 4,
    FoExtTypeSymlink = 5,
    FoExtTypeOplockKey = 6,
    MaxFoExtTypes = 7
};