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....) # Save in default ( Excel2003 ) format workbook . save ( dataDir...out.xls" ) # Save in Excel2003 format workbook . save ( dataDir...