hFile = CreateFile("file", 0x80000000, 3, NULL, 3, 0x80, NULL);
hMap = CreateFileMapping(hFile, NULL, 2, sizeHigh, sizeLow, NULL);
ptr = MapViewOfFile(hMap, 4, 0, 0, size);
CloseHandle(hMap);
CloseHandle(hFile);

/* At this point the handles are closed so programs that try
   to get share exclusive on the file succeed but I still have
   a pointer for reading the memory myself */

UnmapViewOfFile(ptr);