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....= "A1" ; // Save the result on disc book . Save ( dir + "output...AutoFitColumns (); // Save the spreadsheet on disc book . Save ( dir + "output...