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//0x18 bytes (sizeof)
struct _IO_SECURITY_CONTEXT
{
    struct _SECURITY_QUALITY_OF_SERVICE* SecurityQos;                       //0x0
    struct _ACCESS_STATE* AccessState;                                      //0x8
    ULONG DesiredAccess;                                                    //0x10
    ULONG FullCreateOptions;                                                //0x14
};