The extension of Excel files is .. ?

xls / xlsx

It depends on the following:

Excell97-2003 version:  .xls

Ms Office Excell new version:  .xlsx

Excell stencil97-2003 version: .xlt

Excell stencil new version:  .xltx

Excell complement97-2003 version: .xla

Excell complement new version: .xlam

 

Excel Workbook : .xlsx

 

Excel Workbook (code) : .xlsm

 

Excel Binary Workbook : .xlsb

 

Template : .xltx

 

Template (code) : .xltm

 

Excel97- Excel2003 Workbook : .xls

 

Excel97- Excel2003 Template : .xlt

 

Microsoft Excel5.0/95 Workbook :.xls 

 

 

XML Spreadsheet2003 :.xml

 

 

XML Data :  :.xml

 

 

Excel Add-In  :.xlam

 

 

Excel97-2003 Add-In : :.xla

 

 

Excel4.0 Workbook :.xlw

 

 

 

 

xls

xlsx

. Xls

Xlsx

The older one is .Xls

The recent one is .Xlsx

Depending on Microsoft Office version, can be .xls, xlsx, but not only there is also other extensions for Excel, like .xlt, .xlam....

File formats that are supported in Excel

 

 In Excel2010, you can use other formats such as PDF and XPS.Read an article or try Office2010!

 

You can save a Microsoft Office Excel2007 file in another file format by clicking the Microsoft Office Button , and then clicking Save As. The file formats that are available in the Save As dialog box vary, depending on what type of sheet is active (a worksheet, chart sheet, or other type of sheet).

You can open a file that was created in another file format (in an earlier version of Microsoft Office Excel or in another program) by clicking the Microsoft Office Button , and then clicking Open. You will be prompted to save it to an Office Excel2007 format, unless you open a workbook that is shared. For files that were created in an earlier version of Excel, you have the option to keep the original format.

 NOTE   Whenever you save a file in another file format, some of its formatting, data, and features may be lost. For more information, see Formatting and features that are not transferred in Excel file format conversions.

In this article

• Excel formats
• Text formats
• Other formats
• Clipboard formats
• File formats that are not supported in Excel2007

Excel formats FORMATEXTENSIONDESCRIPTIONExcel Workbook .xlsx The default Office Excel2007 XML-based file format. Cannot store Microsoft Visual Basic for Applications (VBA) macro code or Microsoft Office Excel4.0 macro sheets (.xlm). Excel Workbook (code) .xlsm The Office Excel2007 XML-based and macro-enabled file format. Stores VBA macro code or Excel4.0 macro sheets (.xlm). Excel Binary Workbook .xlsb The Office Excel2007 Binary file format (BIFF12). Template .xltx The default Office Excel2007 file format for an Excel template. Cannot store VBA macro code or Excel4.0 macro sheets (.xlm). Template (code) .xltm The Office Excel2007 macro-enabled file format for an Excel template. Stores VBA macro code or Excel4.0 macro sheets (.xlm). Excel97- Excel2003 Workbook .xls The Excel97 - Excel2003 Binary file format (BIFF8). Excel97- Excel2003 Template .xlt The Excel97 - Excel2003 Binary file format (BIFF8) for an Excel template. Microsoft Excel5.0/95 Workbook .xls The Excel5.0/95 Binary file format (BIFF5). XML Spreadsheet2003 .xml XML Spreadsheet2003 file format (XMLSS). XML Data .xml XML Data format. Excel Add-In .xlam The Office Excel2007 XML-based and macro-enabled Add-In, a supplemental program that is designed to run additional code. Supports the use of VBA projects and Excel4.0 macro sheets (.xlm). Excel97-2003 Add-In .xla The Excel97-2003 Add-In, a supplemental program that is designed to run additional code. Supports the use of VBA projects. Excel4.0 Workbook .xlw An Excel4.0 file format that saves only worksheets, chart sheets, and macro sheets. You can open a workbook in this file format in Office Excel2007, but you cannot save an Excel file to this file format.

usually2 

xls and xlsx

Depending on which version you might be using, older versions of MS Excel(97 to2003) use the .xls extension where as the newer versions use the .xlsx extension. Other extensions that could be use are the .csv and .xml

• xls – Legacy Excel worksheets; officially designated "Microsoft Excel97-2003 Worksheet"

 

• xlt – Legacy Excel templates; officially designated "Microsoft Excel97-2003 Template"

 

• xlm – Excel macro

OOXMLOffice Open XML (OOXML) format was introduced with Microsoft Office2007 and became the default format of Microsoft Excel ever since. Excel-related file extensions of this format include:

• xlsx – Excel workbook

 

• xlsm – Excel macro-enabled workbook; same as xlsx but may contain macros and scripts

 

• xltx – Excel template

 

• xltm – Excel macro-enabled template; same as xltx but may contain macros and scripts

 

Other formatsMicrosoft Excel uses dedicated file format that are not part of OOXML and use the following extensions:

• xlsb – Excel binary worksheet (BIFF12)

 

• xla – Excel add-in or macro

 

• xlam – Excel add-in

 

• xll – Excel XLL add-in; a form of DLL-based add-in[1]

 

• xlw – Excel workspace; previously known as "workbook"