Excel 2003 and earlier: .XLSExcel 2007 and later: .XLSX
rar
There are lots of archive types: zip is most commonly used and the simplest archive formatrar is a good format used mostly on windowsThere are also many other archive formats, like:tar - it just...
Excel 2003: .xls = Workbook .xla = VBA Add-in .xlb = Toolbar (where custom toolbar settings are stored) .xlc = Chart .xld = Dialog (from older versions of Excel) .xlk = Archive (Excel spreadsheet...
the .xls