Hello, I understand that you need a Desktop application or an Excel add-in to be precise that can convert the Excel workbook (XLS format) to CSV format (UTF8 encoding). The converted file needs to be opened on Android, IOS and MS Windows. I also understand that the XLS file contains English, Hebrew and Arabic characters. Furthermore, the program needs to be compatible with Excel 2013 and there must be an installer bundled that will install the add-in easily to Excel without manually doing it. I am a .NET, VBA and VSTO software developer. I have nine years of experience in programming. I rest-assure that I will complete the work on time and deliver you the completed work to your satisfaction. Please see chat message for details.