Similar question has been answered here:What_is_the_file_extension_for_Microsoft_excel_file
Default file format for Excel 2003: .xls Default file format for Excel 2007: .xlsx Note: You can't open lower version file format in upper version. If you want to do this then you will have to download the compatibility pack.
The default file name for all versions of Microsoft Excel is called "book1"
There are no set file extensions for an ASCII text file, however one that is commonly used is .txt
The default file ext for Excel 2010 default install is .xlsx as it was in 2007. 2003 was the last version with a different extension, which was .xls for workbooks.Te default file ext may be changed by going into File-> Options -> Save -> Save in this format.If there is a group policy in place, Excel will inherit the default file extension specified.
File extensions for web pages usually are .html.
A default filename is a name given to a file if you do not choose your own. In Excel the first default filename used is Book1.xls and your file will be called this if you don't specify another one.
The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.The default file is Book1 when you start. The extension is .xls for versions of Excel up to 2003 and from version 2007 onwards it would be .xlsx as the extension.
Excel 2003 and earlier: .XLS Excel 2007 and later: .XLSX
The xlsx file extensions are from Excel 2007 whereas xls is used in the earlier versions of Excel.Thanks
Windows hides file extensions in File Explorer by default for known file types to simplify the user experience and reduce clutter. This setting can be adjusted in the Folder Options menu, where users can choose to show file extensions for all files. The option is typically turned on for security reasons, as displaying extensions can help users identify potentially harmful files. To view file extensions, users can enable the "File name extensions" checkbox in the "View" tab of the Ribbon in File Explorer.
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.
By default, text in Excel is left aligned.