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" ); $ ok ++; print "open $ok\n"...); $ workbook -> save ( "t1.xls" ); $ ok ++; print "save $ok\n"...