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Unable to create multiple PowerPoint instances

I am working on a project where I need to use PowerPoint from C # .net. Initially, I always created one instance. Today I would like to run several instances. I do it like this:

Type powerpointType = Type.GetTypeFromProgID("PowerPoint.Application");

object instance1 = Activator.CreateInstance(powerpointType);
object instance2 = Activator.CreateInstance(powerpointType);

but when I request a handle to both instances, calling

hwnd = (int)powerpointType.GetProperty("HWND").GetValue(instance1, null);

then i get the same descriptor twice. I came to the conclusion that the application is launched only once, and the TaskManager confirms the following: Only one process.

How is it that only one instance of PowerPoint works, and how can I get it to work?

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5 answers

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Dim ap As Presentation
Set ap = Presentations.Open(FileName:="yourppt.pptx", WithWindow:=msoFalse)
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For Each s In ap.Slides
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Next

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