Excel files use the .XLS file extension. Open 400+ file formats with File Viewer Plus. XL files are Excel Spreadsheets. They store data in rows and columns. XL was an earlier Excel format. It is no longer supported. The data can be exported to CSV or PDF. XL files could only be opened in Excel. The XL file extension indicates a Spreadsheet File. Excel Spreadsheets work on Windows and Mac. Microsoft Excel is recommended to open XL files. If Excel cannot open, try Microsoft Office. Some problems opening XL files can be solved by associating XL with the right application or updating Excel. The XL file extension has multiple formats. Most are Excel Spreadsheets developed by Microsoft, often opened in Microsoft Office. XL file extensions can also indicate alternative Excel file types. XL files store spreadsheets similar to XLS files. They can contain data in rows and columns. XL documents can be exported. XLS is preferred over XL for Excel files now. Programs that can open XL files include Excel and Microsoft Office.
Microsoft Excel
Google Sheets
LibreOffice Calc