<Tr> <Td> Chart </Td> <Td>. xlc </Td> <Td> A chart created with data from a Microsoft Excel spreadsheet that only saves the chart . To save the chart and spreadsheet save as . XLS . XLC is not supported in Excel 2007 or in any newer versions of Excel . </Td> </Tr> <Tr> <Td> Dialog </Td> <Td>. xld </Td> <Td> Used in older versions of Excel . </Td> </Tr> <Tr> <Td> Archive </Td> <Td>. xlk </Td> <Td> A backup of an Excel Spreadsheet </Td> </Tr> <Tr> <Td> Add - in (DLL) </Td> <Td>. xll </Td> <Td> Adds custom functionality; written in C++ / C, Visual Basic, Fortran, etc. and compiled in to a special dynamic - link library </Td> </Tr>

In excel the is made up of the chart and all its elements