typedef struct _SECTION_IMAGE_INFORMATION
{
     PVOID TransferAddress;
     ULONG ZeroBits;
     ULONG MaximumStackSize;
     ULONG CommittedStackSize;
     ULONG SubSystemType;
     union
     {
          struct
          {
               WORD SubSystemMinorVersion;
               WORD SubSystemMajorVersion;
          };
          ULONG SubSystemVersion;
     };
     ULONG GpValue;
     WORD ImageCharacteristics;
     WORD DllCharacteristics;
     WORD Machine;
     UCHAR ImageContainsCode;
     UCHAR ImageFlags;
     ULONG ComPlusNativeReady: 1;
     ULONG ComPlusILOnly: 1;
     ULONG ImageDynamicallyRelocated: 1;
     ULONG Reserved: 5;
     ULONG LoaderFlags;
     ULONG ImageFileSize;
     ULONG CheckSum;
} SECTION_IMAGE_INFORMATION, *PSECTION_IMAGE_INFORMATION;

Windows Vista Kernel Structures