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....Excel or other formats XLSX XLS, CSV, SpreadsheetML 2003, XLSX...ODS, Plain Text (TXT), PDF, XPS Convert between Excel formats...