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
.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.
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.
the publish option
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..xlsx is a Excel 2007 format, whereas .xls is Excel 2003 or earlier. Excel 2007 allows you to save in multiple 2007 formats: ..xlsx - Normal Excel 2007 format ..xlsm - Macro-Enabled format ..xlsb - Binary format Save your files as 2003 under Save as Type and you should be fine.