Why Inventor API opens every time the same Inventor Version

[Anonymous]

Hello guys,

I installed on my machine Inventor 2019 and Inventor 2021. At the moment I am writing a small Inventor API test and I wanna figure out why Inventor API opens every time Inventor 2019 by using this code:

Type invtype = System.Type.GetTypeFromProgID("Inventor.Application");
var inventorApplication = System.Activator.CreateInstance(invtype) as Inventor.Application;

 It opens also 2019 even I register the Inventor 2021 as default by opening it and approving the prompt message about reregistering Inventor to 2021 version. The reason why I am doing the test is, I want to figure out how to open a specific Inventor Version with Iventor API.

[bradeneuropeArthur]

If you make the reference in the app to the 2021 version it should not open the 2019 version anymore!

[Anonymous]

Thank you for answering. How I should do the reference to the 2021 version?

[Anonymous]

I mean in the C# Code.

[bradeneuropeArthur]