Excel 2007 does use the .xlsx extension for its workbooks.
xlsx is the main extension used for Excel 2007.
.xlsx is the file format used in Microsoft Office Excel 2007. It is NOT backwards compatible (i.e. Excel 2003 and earlier versions cannot open it). The file is XML based and smaller in size than the .xls format. It is possible to open, edit, and save a .xls file in Excel 2007 for backward compatibility.
.xls for the lower version If you are using the Microsoft Office 2007, it's .xlsx
the normal extension for Excel is xls if pre 2007 otherwise xlsx
The native file format for Microsoft Excel is XLSX. XLSX is a file format used to store spreadsheets created using Microsoft Excel. It is based on the Office Open XML standard and is a compressed file that contains data, formatting, charts, and other elements of a spreadsheet. The XLSX format was introduced in Excel 2007 as an improvement over the older XLS format.
.xlsx is the file format used in Microsoft Office Excel 2007. It is NOT backwards compatible (i.e. Excel 2003 and earlier versions cannot open it). The file is XML based and smaller in size than the .xls format. It is possible to open, edit, and save a .xls file in Excel 2007 for backward compatibility.
The xlsx file extensions are from Excel 2007 whereas xls is used in the earlier versions of Excel.Thanks
The standard extension for Excel workbooks is xls for versions up to 2003. Excel 2007 uses xlsx as its extension for workbooks.
For a standard Excel document, prior to Excel 2007, it is xls and xlsx is used in 2007. There are other kinds of files created by Excel, like templates which can be xlt or macros which can be xlm and xla for Add-ins, and there are other extenions. For 2007, you add x to the end of them.
the publish option
Excel files are usually .xls In Office 2007 Excel files that are single pages are still .xls while workbooks (more than one page) are .xlsx There are other extension for documents that are web pages in Excel, documents that have macros enabled and other such things. To find out, go to your Excel program and click "save as" When the menu comes up, click on the pull down menu "save as type" You will be able to see all the different options there.
XLSX is the file extension for Microsoft Excel files saved in the newer XML-based format introduced in Excel 2007. It is used for storing spreadsheets with formulas, charts, and data in a structured manner.