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What Version of Aspose.Slides Was a PowerPoint Presentation Created with?

Does Aspose record somewhere on a PowerPoint presentation that it created what version of Aspose was used to create it? Maybe in metadata somewhere in the document. (Note: I’m talking about licensed situations; I know the version number shows in a watermark when created with an unlicensed version).

Thank you for posting the inquiry.
Yes, Aspose.Slides records the version into document properties. You can use the following code example to read the application name and application version:

using (var presentation = new Presentation("test.pptx"))
    var appName = presentation.DocumentProperties.NameOfApplication;
    var appVersion = presentation.DocumentProperties.AppVersion;

    Console.WriteLine($"{appName} {appVersion}");

Documents: Presentation Properties
API Reference: IDocumentProperties Interface