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.... Xlsx 6 Represents an xlsx file. Xlsm 7 Represents...5 Represents an Excel97-2003 xls file. SpreadsheetML 15 Represents...