.xls for 97-2003 and .xlsx for 2007 and 2010.
The file extension of MS Excel is .xmls
.xl is the file extension for Excel documents.
xlsx
Default file extension for MS Excel 2003 & earlier versions is .xlsDefault file extension for MS Excel 2007 & later versions is .xlsx
The extension for excel is .xls
The standard extension for Excel workbooks is xls for versions up to 2003. Excel 2007 uses xlsx as its extension for workbooks.
For most typical Word documents the extension is .docFor Excel workbooks (spreadsheets) the extension is .xlsIn general the file extension is the 3 letter/number "code" after the period in the complete file name that gives a hint as to what type of file it is. For example, in the file name resume.docthe word resume is the file's actual name and the .doc tells you that it is a document file.
Excel saves files using a .xls extension (Excel 2003 and earlier) or .xlsx extenstion (Excel 2007 and later).
They are short for "Excel Spreadsheet."
XLS is the shorthand for Microsoft Excel file extension. A file extension is the group of letters following a period in a file name, denoting what kind of file it is.
* The file extension of a Word document is .doc * The file extension of an Excel speadsheet is .xls
xls