Running Win 10 using Microsoft 365.
If I don't have Excel open and try to open a .xls file it fails. Opens .xlsx OK
Message "Sorry we couldn't find /e.xlsx. Is it possible it was moved, renamed or deleted." is displayed.
If I open excel first and use File > Open it will open the file.
If Excel is open but I use a shortcut to try to open a .xls file it fails with above message.
My only get round would be to find every .xls file on my machine, open Excel, open file, save it as a .xlsx and delete the old file, changing shortcuts where used. Not practical.
Files are on a hard drive.