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using (PowerPointTemplate ppt = new PowerPointTemplate())
{
    ppt.Open("MyInputFilePath.pptx");
    
    using (FileStream outputFile = File.OpenWrite("MyOutputFilePath.pptx"))
    {
        ppt.Save(outputFile);
    }
}	

Using ppt As New PowerPointTemplate()

    ppt.Open("MyInputFilePath.pptx");
    
    Using outputFile As File.OpenWrite("MyOutputFilePath.pptx")
    
        ppt.Save(outputFile);

    End Using
    
End Using