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....srcFileName = FilePath + "Conversion PPT to PPTX.ppt" ; string...destFileName = FilePath + "Conversion PPT to PPTX.pptx" ; //实例...