Yes. It is .xls for version up to Excel 2003 and .xlsx for versions from Excel 2007 onwards.
xlsx
Every Excel workbook (spreadsheet or spreadsheets) has a file to store all the information of the workbook.Example: Suppose you have created a Student workbook then the name of file is student.doc/docx/etc.The file extension of the file depends upon the version of MS Excel.
It would be a workbook with a .xls or now more commonly a .xlsx extension.
It would be a workbook with a .xls or now more commonly a .xlsx extension.
A saved workbook is referred to as a file in Microsoft Excel. This file typically has a .xlsx extension and contains all the data, formatting, and calculations that have been input into the workbook.
It is a collection of worksheets and known as a workbook, and has a .xls extension.
In Excel, this is referred to as a "workbook".
file
The default file ext for Excel 2010 default install is .xlsx as it was in 2007. 2003 was the last version with a different extension, which was .xls for workbooks.Te default file ext may be changed by going into File-> Options -> Save -> Save in this format.If there is a group policy in place, Excel will inherit the default file extension specified.
An Excel Book or Excel Workbook with the files extension of .xlsx
When you create a spreadsheet or workbook then a corresponding file is created on your machine, that file is known as excel file.
An Excel file is known as a workbook. It is typically saved in a file that ends in .xls. This stands for an Excel Spreadsheet. A workbook contains worksheets which are individual spreadsheets.