typedef struct _IMAGE_OPTIONAL_HEADER
{
     WORD Magic;
     UCHAR MajorLinkerVersion;
     UCHAR MinorLinkerVersion;
     ULONG SizeOfCode;
     ULONG SizeOfInitializedData;
     ULONG SizeOfUninitializedData;
     ULONG AddressOfEntryPoint;
     ULONG BaseOfCode;
     ULONG BaseOfData;
     ULONG ImageBase;
     ULONG SectionAlignment;
     ULONG FileAlignment;
     WORD MajorOperatingSystemVersion;
     WORD MinorOperatingSystemVersion;
     WORD MajorImageVersion;
     WORD MinorImageVersion;
     WORD MajorSubsystemVersion;
     WORD MinorSubsystemVersion;
     ULONG Win32VersionValue;
     ULONG SizeOfImage;
     ULONG SizeOfHeaders;
     ULONG CheckSum;
     WORD Subsystem;
     WORD DllCharacteristics;
     ULONG SizeOfStackReserve;
     ULONG SizeOfStackCommit;
     ULONG SizeOfHeapReserve;
     ULONG SizeOfHeapCommit;
     ULONG LoaderFlags;
     ULONG NumberOfRvaAndSizes;
     IMAGE_DATA_DIRECTORY DataDirectory[16];
} IMAGE_OPTIONAL_HEADER, *PIMAGE_OPTIONAL_HEADER;

Windows Vista Kernel Structures