My Numbers is not opening .xls files. Only opens .xlsx
My Numbers (v. 3.5.3) is now only opening .xlsx excel files. I need it to open .xls files. Can I open any of my .xls files that I was able to open on my previous computer with Numbers? I just upgraded from 10.6.8 to 10.10.3 and the Numbers version is the one that came free.