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//0x20 bytes (sizeof)
struct _XSTATE_CONTEXT
{
    ULONGLONG Mask;                                                         //0x0
    ULONG Length;                                                           //0x8
    UCHAR Flags;                                                            //0xc
    UCHAR Reserved0[3];                                                     //0xd
    struct _XSAVE_AREA* Area;                                               //0x10
    VOID* Buffer;                                                           //0x18
};