File types supported in Microsoft Excel 2010

.csv

CSV (Comma delimited)

Saves a workbook as a comma-delimited text file for use on another Windows operating system, and ensures that tab characters, line breaks, and other characters are interpreted correctly. Saves only the active sheet.

.csv

CSV (Macintosh)

Saves a workbook as a comma-delimited text file for use on the Macintosh operating system, and ensures that tab characters, line breaks, and other characters are interpreted correctly. Saves only the active sheet.

.csv

CSV (MS-DOS)

Saves a workbook as a comma-delimited text file for use on the MS-DOS operating system, and ensures that tab characters, line breaks, and other characters are interpreted correctly. Saves only the active sheet.

.dbf

DBF 3, DBF 4

dBase III and IV. Users can open these files formats in Excel. However, users cannot save an Excel file to dBase format.

.dif

DIF (Data Interchange Format)

Saves only the active sheet.

.htm, .html

Web Page

A Web page that is saved as a folder that contains an .htm file and all supporting files, such as images, sound files, scripts, and more.

.mht, .mhtml

Single File Web Page

A Web page that is saved as a single file that includes an .htm file and all supporting files, such as images, sound files, scripts, and more.

.ods

OpenDocument Spreadsheet

A file format for saving Excel 2010 files so that they can be opened in spreadsheet applications that use the OpenDocument Spreadsheet format, such as Google Docs and OpenOffice.org Calc. You can also open spreadsheets in the .ods format in Excel 2010. Formatting might be lost when you save and opening .ods files.

.pdf

PDF

Portable Document Format, a format that preserves document formatting and enables file sharing. When the PDF format file is viewed online or printed, it keeps the format that you intended. Data in the file cannot be easily changed. The PDF format is also useful for documents that will be reproduced by using commercial printing methods.

.prn

Formatted Text (Space delimited)

Lotus space-delimited format. Saves only the active sheet.

.slk

SYLK (Symbolic Link Format)

Saves only the active sheet.

.txt

Text (Tab delimited)

Saves a workbook as a tab-delimited text file for use on another Windows operating system, and ensures that tab characters, line breaks, and other characters are interpreted correctly. Saves only the active sheet.

.txt

Text (Macintosh)

Saves a workbook as a tab-delimited text file for use on the Macintosh operating system, and ensures that tab characters, line breaks, and other characters are interpreted correctly. Saves only the active sheet.

.txt

Text (MS-DOS)

Saves a workbook as a tab-delimited text file for use on the MS-DOS operating system, and ensures that tab characters, line breaks, and other characters are interpreted correctly. Saves only the active sheet.

.txt

Unicode Text

Saves a workbook as Unicode text, a character encoding standard that was developed by the Unicode Consortium. Saves only the active sheet.

.xla

Excel 97–2003 Add-In

The Excel 97–2003 Add-In, a supplemental program that runs additional code and supports VBA projects.

.xlam

Excel Add-In

The XML-based and macro-enabled Add-In format for Excel 2010 and Office Excel 2007. An Add-In is a supplemental program that runs additional code. Supports VBA projects and Excel 4.0 macro sheets (.xlm).

.xls

Excel 97–Excel 2003 Workbook

The Excel 97–Excel 2003 Binary file format.

.xls

Microsoft Excel 5.0/95 Workbook

The Excel 5.0/95 Binary file format.

.xlsb

Excel Binary Workbook

The binary file format for Excel 2010 and Office Excel 2007. This is a fast load-and-save file format for users who need the fastest way possible to load a data file. Supports VBA projects, Excel 4.0 macro sheets, and all the new features that are used in Excel 2007 and Excel 2010. However, this is not an XML file format and is therefore not optimal for accessing and manipulating content without using Excel 2010 or Excel 2007 and the object model.

.xlsm

Excel Macro-Enabled Workbook

The XML-based and macro-enabled file format for Excel 2010 and Office Excel 2007. Stores VBA macro code or Excel 4.0 macro sheets (.xlm).

.xlsx

Excel Workbook

The default XML-based file format for Excel 2010 and Office Excel 2007. Cannot store VBA macro code or Microsoft Excel 4.0 macro sheets (.xlm).

.xlt

Excel 97 - Excel 2003 Template

The Excel 97 - Excel 2003 Binary file format for an Excel template.

.xltm

Excel Macro-Enabled Template

The macro-enabled file format for an Excel template for Excel 2010 and Office Excel 2007. Stores VBA macro code or Excel 4.0 macro sheets (.xlm).

.xltx

Excel Template

The default file format for an Excel template for Excel 2010 and Office Excel 2007. Cannot store VBA macro code or Excel 4.0 macro sheets (.xlm).

.xlw

Excel 4.0 Workbook

An Excel 4.0 file format that saves only worksheets, chart sheets, and macro sheets. You can open a workbook in this file format in Excel 2010. However, you cannot save an Excel file to this file format.

.xml

XML Spreadsheet 2003

XML Spreadsheet 2003 file format.

.xml

XML Data

XML Data format.

.xps

XPS Document

XML Paper Specification, a file format that preserves document formatting and enables file sharing. When the XPS file is viewed online or printed, it maintains exactly the format that you intended, and the data in the file cannot be easily changed.

Microsoft Excel for Mac    
A popular spreadsheet application from the Microsoft Office suite

Microsoft Office for Mac    
The latest release of Microsoft's productivity suite for Mac