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 XLSB Excel XLTX Excel XLTM SpreadsheetML Portable Document...cells . SaveFormat . XLTM : ext = "xltm" ; break ; case com ...