typedef struct _IMAGE_FILE_HEADER
{
     WORD Machine;
     WORD NumberOfSections;
     ULONG TimeDateStamp;
     ULONG PointerToSymbolTable;
     ULONG NumberOfSymbols;
     WORD SizeOfOptionalHeader;
     WORD Characteristics;
} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;

Windows Vista Kernel Structures