This is the native file format of Microsoft Excel, a very popular spreadsheet application. In older versions (up to Excel 4.0), the data was saved in the Binary Interchange File Format (BIFF). Later, the format was encapsulated in an OLE storage file.
If you do not have Excel, you can use the free Excel Viewer to view the contents of an Excel Spreadsheet.
Quick Info:
Name: Microsoft Excel Spreadsheet
Type: Spreadsheet
Extension: XLS
Native Application: Microsoft Excel
Viewer Application: Micosoft Excel Viewer (Download)
Specification: Not Available
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Alexander Krauss