In Excel Windows you can choose between point or comma as decimal separator. In Excel Mac you cannot. About half of the world uses comma like Sweden and imported documents from the U.S. and some other countries always cause a lot of problems. So please let me set point or comma as decimal separator for each document.

The ideal solution would of course be a new separator that would be standard all over the world and Microsoft together with international bodies.
https://en.wikipedia.org/wiki/Decimal_separator