Xlsx and xls files are microsoft excel spreadsheets commonly used to store financial data and to create mathematical models. There are differences in the xlsx and xls formats created by excel. Xls file onto the program window. The idm crack is available in link below and you didnt need to register internet download manager because it is preactivated version. File viewer lite is a free program that can open microsoft excel.Having bought a subscription, you can download this or other directories on our website. To download the file, click on the button below.