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....XLS – Microsoft Excel 97–2003 XLSX – Office Open XML XLSM, XLTX...XLS – Microsoft Excel 97–2003 XLSX – Office Open XML XLSM – Office...