File Type Microsoft Excel Spreadsheet (Legacy) IconMicrosoft Excel Spreadsheet (Legacy)
File Format Proprietary (Microsoft)
Usage Referenced by an application; not meant to be opened manually; may run a program or script when opened
Popularity ★ ★ ★ ★ ★  Popular

An XLS file is a spreadsheet created with Excel 2003 or earlier for Windows or Excel 2003 or earlier for Macintosh systems. It contains data stored in cells, which are organized into rows and columns. Each spreadsheet may also contain multiple sheets.

IMPORTANT: Beginning with Excel 2007, spreadsheets are saved in the OpenXML format and use the .XLSX extension.

Info About Microsoft Excel

Excel is a popular spreadsheet program. It is widely used by businesses, but is also available to consumers. Excel includes advanced spreadsheet capabilities and supports complex formulas, which can be used to calculate the values of individual cells. It is commonly used to create and store "sheets" of data in an organized format.

Open With

IconMicrosoft Excel

IconCorel Quattro Pro

IconOpenOffice Calc


IconMicrosoft Excel

IconApple Numbers

IconOpenOffice Calc


IconOpenOffice Calc



Updated July 21, 2009
Information from the PC File Extensions Reference