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 – Microsoft Excel 97~2003 XLSX – Office Open XML XLSM, XLTX...XLTX, XLTM – Office Open XML CSV – Comma Separated Values Worksheet...