PresentationMLPackage presentationMLPackage =
(PresentationMLPackage)OpcPackage.load(new java.io.File(inputfilepath));
System.out.println("\n\n saving .. \n\n");
String outputfilepath = System.getProperty("user.dir") + "/sample-docs/pptx-out.pptx";
presentationMLPackage.save(new java.io.File(outputfilepath));
System.out.println("\n\n done .. \n\n");
}
}