EXTENDED_CREATE_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTIOAPI_H

typedef struct _EXTENDED_CREATE_INFORMATION
{
    LONGLONG ExtendedCreateFlags;
    PVOID EaBuffer;
    ULONG EaLength;
} EXTENDED_CREATE_INFORMATION, *PEXTENDED_CREATE_INFORMATION;

#endif

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This structure is documented in Windows Driver Kit.