Xls File Extension
Xls is a file extension of Microsoft Office Excel File. It is used for calculating and drawing tables. It can be opened by Ms Office Excel.
Excel is a software can be used for calculating and drawing tables. It is used to make calculation results with formulas, graphics, diagrams, percent value tables and other various transactions.
Excel is a purchase required software and it can be installed with a CD called Microsoft Office Pack. As an alternative, with Excel viewer software you can see this file via open office software.
What needed to Open Xls file extensions.
MS Office Excel or free alternatives
Links about Xls file extension