When using the ErrorBars property in Microsoft.Office.Core.IMsoSeries using COM automation, I get a COM exception "Interface not registered" while it works fine using the property within an add-in.

I noticed that the interface IMsoErrorBars is not registered in Windows Registry like all other Office API interfaces are (or at least the ones if have been using so far). I checked several machines with Office 2010 or 2013 installed and they all missed the IID `{000C1721-0000-0000-C000-000000000046}` in `HKEY_CLASSES_ROOT\Interface`.

Does anybody know why it's missing?

**UDPATE**

Here's as example in C# ...

```
IEnumerable<int> ErrorBarsColors(Microsoft.Office.Interop.PowerPoint.Shape shape)
{
    var seriesCollection = shape.Chart.SeriesCollection() as IEnumerable;

    foreach (Microsoft.Office.Core.IMsoSeries series in seriesCollection)
    {
        if (series.HasErrorBars)
        {
            var errorBars = series.ErrorBars;
            yield return errorBars.Format.Line.ForeColor.RGB;
        }
    }
}

```

... that fails with the mentioned COM exception at the series.ErrorBars access when it's called in a stand-alone application using some code like this:

```
var application = new Microsoft.Office.Interop.PowerPoint.Application();
var presentation = application.Presentations.Open(SOME_PRESENTATION);
var shape = presentation.Slides[1].Shapes[1];
var colors = ErrorBarsColors(shape);

```

But the same code works perfectly when using it in a PowerPoint Add-In.

Meanwhile I found some other interfaces that neither are registered and show the same behavior.