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//0x28 bytes (sizeof)
struct _ACTIVATION_CONTEXT_STACK64
{
    ULONGLONG ActiveFrame;                                                  //0x0
    struct LIST_ENTRY64 FrameListCache;                                     //0x8
    ULONG Flags;                                                            //0x18
    ULONG NextCookieSequenceNumber;                                         //0x1c
    ULONG StackId;                                                          //0x20
};