XLS is the main extension name used in Excel.
The standard extension for Excel workbooks is xls for versions up to 2003. Excel 2007 uses xlsx as its extension for workbooks.
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I am not aware of a name menu in Excel. However, Excel has a name box that displays the name or cell reference of the active cell.
Ms excel
Microsoft Excel is a spreadsheet.
You're computer is regonising a file as an "Unknown File" only because it has no understanding of that file extention. Right click the file and select "Properties", find the extention name (Eg, .exe) and search for software that will read that extention name. If you're having further problems consult someone on a Technical Help Forum.
Maeva Excel's birth name is Anicia Greck.
The extension is used to identify the file type and enable it to be opened by the right software. By having extensions we can also give files that are related the same name in different applications. So you could have a file for finances in a Word document called Finances.doc and one in Excel called Finances.xls too. You can also estimate the versions of the software that created the file. Up to Excel 2003 .xls was used and since Excel 2007 .xlsx has been used.
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The File name will usually appear at the top of the excel file. It should look something like this: file name - Microsoft Excel...