SvcBusThreadPoolTimer constructor method (with bug)

SvcBusThreadPoolTimer_init().c

int SvcBusThreadPoolTimer_init( SvcBusThreadPoolTimer* _this, SvcBusThreadPool* pool, SvcBusThreadPool_callback callback, void* context, unsigned int millis )
{
  FILETIME FileDueTime;
  ULARGE_INTEGER ulDueTime;

  _this->timer = CreateThreadpoolTimer( &SvcBusThreadPoolTimer_TimerCallback, _this, &pool->pcbe );
  if( _this->timer == NULL )
  {
    return SVCBUS_THREADPOOL_ERROR;
  }
  _this->context = context;
  _this->thread_id = 0;
  _this->callback = callback;
  ulDueTime.QuadPart = millis * 10 /* 100 nanosecond increments per microsecond */ * 1000 /* microseconds per millisecond */; 
  FileDueTime.dwHighDateTime = ulDueTime.HighPart;
  FileDueTime.dwLowDateTime = ulDueTime.LowPart;
  SetThreadpoolTimer( _this->timer, &FileDueTime, millis, 0 );

  return SVCBUS_THREADPOOL_OK;
}