XLSX File Extension

TIP: Run a Free Scan for .XLSX File Errors.

The .XLSX extension belongs to the Microsoft Office 2007 suite (and above) and is a new format based on XML. This new XML format currently applies to the Word, Excel and PowerPoint components of MS Office and is known as the Microsoft Office Open XML format.

How to Open .XLSX (Microsoft Office Excel (2007+) Spreadsheet) files

Windows

Microsoft Office Excel (2007+)

Mac OS

Microsoft Office Excel (2007+)

Additional extension information

File type:	Data
Popularity:	Widespread
Author:	Microsoft
MIME type:	Not specified

Related links

Microsoft's "Office Open XML" file formats

Visitor comments

Flat Rockit

2008-12-08 14:45:12

What a nasty little suprise. I buy a new PC with Vista and get Office 2007. Now when I send a friend a spread sheet with basic club info.; he can not open it. Vista windows explorer did not show me the .xlsx extnsion. But good old CMD did. Grrrr. Grrr.Would be nice to have an option to save stuff with plain old .xls for my down rev friends who do not really need all the fancy do dah "improvements". Hey Mr. Bill; there are a bunch of former friends of Bill out here who would pay for a version that offered retro as an option. With PCs having enough power to re-calc the interest on the national debt in a second; shouldn't be a big deal. It would help us out not to have to keep buying upgrades during the recession.

Jay

ADMIN

2008-12-08 18:50:03

Hi,Excel does have an option to export to retro .XLS format. When you go to save your spreadsheet, you'll see a drop-down list titled "Save as type", click this box and you should see "Excel 97-2003 workbook" - this will save your files in the old .xls format.

Ian Fischer

2009-01-06 08:55:03

I have a 32 gig flash drive with an Excel (Office 2007) file on it containing all my passwords and private information.After installing a new HDD and reinstalling MS Office 2007, I now find that I cannot open the Excel file and keep getting the message about the "xlsx format etc".I have tried everything I know to open it but nothing works! Is there any way I can get this wretched file to open or have I lost everything?Thing is it was all created on the 2007 Excel and nothing has changed except re-installation. Thanks!

Jay

ADMIN

2009-01-06 11:43:20

Hi Ian,What is the full text of the error?

Mike Sawyer

2009-01-27 07:12:01

I am having similar problems with xlsx files on Vista with Office 2007. When I save them I cannot reopen them - it says they are either corrupt or not able to be opened by Excel 2007, also happens if I try to save them as 2003 format xls, wont let me reopen them

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Microsoft Office Excel (2007+) Spreadsheet