typedef struct _IMAGE_DEBUG_DIRECTORY
{
     ULONG Characteristics;
     ULONG TimeDateStamp;
     WORD MajorVersion;
     WORD MinorVersion;
     ULONG Type;
     ULONG SizeOfData;
     ULONG AddressOfRawData;
     ULONG PointerToRawData;
} IMAGE_DEBUG_DIRECTORY, *PIMAGE_DEBUG_DIRECTORY;

Windows Vista Kernel Structures