Just take the ususal suspect code
Presentation presentation = new Presentation("example.pptx");
presentation.Save("output.html", SaveFormat.Html5);
Will throw
System.ArgumentException: Resource not found (Parameter …...sample presentation file (you can zip it and upload an archive here)...January 24, 2024, 3:01pm 3 07.zip (1,4 MB) Using .NET 4.8 and WIn10...