.xls for the lower version
If you are using the Microsoft Office 2007, it's .xlsx
The extension for excel is .xls
Normally xls is the extension for an Excel spreadsheet document.
You are referring to the the extension. For Powerpoint it is PPT and XLS is used by Excel.
For workbooks in Excel 2003, the extension .xls is used.
Excel 2013 uses a .xlsx extension.
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.
An Excel Book or Excel Workbook with the files extension of .xlsx
xlsx is the main extension used for Excel 2007.
.XLS files are standard Microsoft Excel spreadsheet files. .XLT extension is used for the Excel template files. - Neeraj Sharma
The standard extension for Excel workbooks is xls for versions up to 2003. Excel 2007 uses xlsx as its extension for workbooks.
The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.The .xls extension is the extension for Excel files up to version of Excel 2003. A computer will know what versions of Excel it refers to. It also makes it easier for users to identify types of files so they can find their Excel files when they are looking for them. If you did not use the correct extension, both users and the computer will find it harder to find them and the computer may not open them properly.
the normal extension for Excel is xls if pre 2007 otherwise xlsx