Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms....]); } // Save the PPTX file to the disk pres . Save ( "EmptySlide...the presentation file pres . Save ( "modified.pptx" , SaveFormat...