What is an XLS File?
An XLS file is a spreadsheet formatted file that may also contain mathematical functions, styles, charts, and formatting. It was developed by Microsoft for Microsoft Excel but can also be opened and edited by other spreadsheet programs, like Apple Numbers or OpenOffice Calc.
When Excel was first released in 1987, the Microsoft Excel Spreadsheet (XLS) binary format was also released. Up until the introduction of Microsoft Excel in 2007, XLS files became one of the most popular file types for preserving spreadsheets. However, it was later replaced with the Microsoft Excel Open XML Spreadsheet (XLSX) format. Excel spreadsheets are now typically saved in XLSX files.
Download XLS Sample Files
Below you can download .XLS sample files that are available in different sizes and perform your tests accordingly.