The standard extension for Excel workbooks is xls for versions up to 2003. Excel 2007 uses xlsx as its extension for workbooks.
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.
For workbooks in Excel 2003, the extension .xls is used.
The default file name for all versions of Microsoft Excel is called "book1"
The File name will usually appear at the top of the excel file. It should look something like this: file name - Microsoft Excel...
.xls for versions up to Excel 2003 and .xlsx from Excel 2007 onwards.
The file extension of Windows mail is .eml
They are short for "Excel Spreadsheet."
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.
The extension. It tells Windows what kind of a file it is. For example, a file with the ".doc" extension is a Microsoft Word Document.
.xls for 97-2003 and .xlsx for 2007 and 2010.
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