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XLSX files as well as their predecessor, XLS, are produced by Microsoft Excel, which is part of the MS Office suite. The Excel format is a very useful tool that can create spreadsheets with data and complex mathematical formulas, among others.

.xlsx extension and its tech properties

The updated version replaced the first one in 2007 and contains a number of improvements. Business users turned to an open file format in terms of transferring input between apps, therefore Microsoft had no other option but to introduce the new extension. The letter ‘X’ stands for XML - eXtensible Markup Language that makes it easier for a computer to read and store data. Another advantage is that files are automatically compressed which significantly reduces their size.

Besides, file security while transferring it via the Internet is no longer an issue because XML data is stored as plain text. Users can open the new format in any other spreadsheet application, e.g. Open Office, Google Docs, or Apple Numbers for Mac users.

Those who prefer reading and editing files online might as well upload them via Google Sheets. Problems with opening the updated extension might arise only if you use an old version of MS Office (earlier than 2007).

File extension
xls/xlsx
Internet media type
Spreadsheet
Programs that use this format
Gnumeric
KSpread
LibreOffice Calc
Google Sheets
Zoho Sheet
Apple iWork Numbers
Microsoft Office Excel
Developer
Microsoft

FAQ

Is XLSX compatible with XLS?
XLS files can be opened with all versions of Excel due to the backward compatibility. However, XLSX can only be opened with Excel 2007 and lateral versions only.
What program opens XLSX files?
xlsx file extension is a Microsoft Excel Open XML Spreadsheet (XLSX) file created by Microsoft Excel. You can also open this format in other spreadsheet apps, such as Apple Numbers, Google Docs, and OpenOffice.
How do I convert an XLSX file to Excel?
Save a workbook in another file formatOpen the workbook you want to save.Click File > Save As.Under Places, pick the place where you want to save the workbook. ... In the Save As dialog box, navigate to the location you want.In the Save as type list, click the file format you want.More items...
How do I view XLSX files?
How to Read Multiple Excel (xlsx) Files in PythonImport the Modules. In the first step, we are going to import the modules Path, glob, and openpyxl Read all xlsx Files in the Directory to a List. ... Create Workbook Objects (i.e., read the xlsx files) ... Work with the Imported Excel Files.Feb 16, 2020
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 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 the difference between Excel 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.
Why can't I open .XLSX files in Excel?
xlsx' because the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file." It usually indicates the file is not compatible with the Excel version of the file that has come corrupt or damaged.
How do I open an XLSX file in 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 an XLSX file 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