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XLS is a spreadsheet file extension developed by Microsoft. XLSX, in turn, is also an MS Excel spreadsheet that represents the latest version of the previous one.

Technical features of XLSX files

The first one is used to be the default format for Excel 2003 and older but in 2007 it was replaced by the second one. With this file type, data is stored in worksheets with cells. Such files can contain text, charts, formulas, numbers, various styles, and formatting. The format is most commonly used for creating mathematical models and storing financial data.

These files are stored as a ZIP archive with a collection of individual documents. The key difference between the new and old formats is that the first one uses Open XML while the latter, a proprietary binary format. Besides, to open the old file type a user needed to install the Microsoft Office package. The new extension solves that issue. The spreadsheets can be opened, viewed, and edited online on any device via MS Excel Online, Google Sheets, or other spreadsheet programs.

Strangely enough, the .xls extension has one advantage over its updated variant: such files can be read by all Microsoft Excel versions, while the new extension needs the 2007 or later version.

File extension
Internet media type
Programs that use this format
LibreOffice Calc
Google Sheets
Zoho Sheet
Apple iWork Numbers
Microsoft Office Excel


How do I open an XLSX file in Word?
How to Open Excel Files in WordOpen Word and your document. ... Click on the "Create from File" tab in the Object dialog box. ... Click on the Excel "File Name" and click "OK" to insert it into Word. ... Open Excel and the document to move to Word. ... Open Word and the document where you want to move the Excel information.More items...
How do I create an Excel spreadsheet on my computer?
Open a new, blank workbookClick the File tab.Click New.Under Available Templates, double-click Blank Workbook. Keyboard shortcut To quickly create a new, blank workbook, you can also press CTRL+N.
How do I create an XLSX file?
With the launch of Office 2007, Microsoft changed the default file extension to . xlsx....xlsx file format.Open the file that you want to convert in Excel. Video of the Day.Click the round "Office" button in the top left corner of the screen to open the file menu.Click "Save As."Select "Excel Workbook" from the menu.
What is difference between XLS and XLSX?
XLS files are based on the Binary Interchange File Format (BIFF) and store information in binary format as per XLS File Format Specifications. ... In contrast, an XLSX file is based on Office Open XML format that stores data in compressed XML files in ZIP format.
Is XLSX an XML format?
XLSX was originally developed by Microsoft as an XML-based format to replace the earlier proprietary binary format that uses the . xls file extension [MS-XLS]. Since Excel 2007, XLSX has been the default format for the Save operation.
Is Excel workbook the same as XLSX?
The default file extension is XLSX. The large majority of Excel workbooks uses this format these days. Microsoft says in the Excel help text about the XLSX file format. The default XML-based file format for Excel 2007-2013.
How do I know if my file is XLS or xlsx?
Check the file extension. If it is ". xlsx" then the file was created with Excel 2007. The extension ".
How do I convert xlsx to XLS?
To get started, kindly perform the following steps.Open File Explorer.Go to the View Tab.Tick File name extensions under Show/Hide.Go to the folder where you Excel file is stored.Right-click on the Excel File.Select Rename.Rename ". XLSX" to ". XLS".Click Enter once done.More items...•Nov 3, 2017
How do I convert a CSV file to XLSX?
How to save CSV file in ExcelIn your Excel worksheet, click File > Save as.Browse for the folder where you want to save the file.To save as an Excel file, select Excel Workbook (*. xlsx) from the Save as type drop-down menu. To save as a comma-separated file, select CSV (Comma delimited) or CSV UTF-8.Click Save.Nov 20, 2021
How do I create a .XLSX file?
Create a Table in Excel XLSX File in C#Load an Excel workbook or create a new one using Workbook class.Add data to the cells of the worksheet.Add a new ListObject to the worksheet.Set ListObject. ShowTotals property to true.Calculate the total and save the workbook as an Excel . xlsx file.Jan 21, 2020