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....using ( Presentation pres = new Presentation ( "presentation-4x3...DoNotScale ); pres . Save ( "presentation-16x9.pptx" , SaveFormat...