|Thanks for your really quick reply!|
My bad for not being more descriptive because the file is in a cloud share. Tried to open the same file with a MAC with no problem.
Also, checked and have 3 GB of RAM so that should be more than enough.
From other searches, followed advice and went to blank Excel sheet, changed to manual recalc, then tried to open the sheet with the same result....file name "x" could not be found.