If you have Excel 2007 (that's what made the .xlsx file) then just open it
and choose SAVE AS and pick the 2003 file type (.xls). If you don't have
2007:

-either call up whoever sent you the file and ask them to re-save it.

or

-download the Excel 2007 file viewer and install it (probably harder than
getting the creator to re-save it)

"Mothomas" wrote:

How do I convert .xlsx file to .xls?