View POTX in Java

Presentation presentation = new Presentation("presentation.potx");
try {
    ResponsiveHtmlController controller = new ResponsiveHtmlController();
    HtmlOptions htmlOptions = new HtmlOptions();
    htmlOptions.setHtmlFormatter(HtmlFormatter.createCustomFormatter(controller));

    presentation.save("index.html", SaveFormat.Html, htmlOptions);
} finally {
    presentation.dispose();
}