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//0x18 bytes (sizeof)
struct _MAILSLOT_CREATE_PARAMETERS
{
    ULONG MailslotQuota;                                                    //0x0
    ULONG MaximumMessageSize;                                               //0x4
    union _LARGE_INTEGER ReadTimeout;                                       //0x8
    UCHAR TimeoutSpecified;                                                 //0x10
};