Excel conversion issue? - comma separated vs column separated

[VailA45987]

I have a .csv file that is comma separated between columns.   When I open the file in Excel, the data appears as expected, separated in columns.   However, when a coworker opens the same file in Excel, the data is separated by commas.   

When we check the Control Panel > Region > Additional Settings > 'List Separator' settings, we both show the same setting:  a Comma.   

So why does the data appear as separated by commas for my coworker, however when I open the same file, I see the data separated in columns?

[#2]

@VailA45987 

Let your coworker check File > Options > Advanced in Excel.

Has the check box 'Use system separators' been cleared and has 'Decimal separator' been set to comma?

 

[#3]

@Hans Vogelaar thank you for the info!  That seems to be the issue.   When I reached out to my coworker the next day, she checked her decimal separator setting and it was set to a 'comma' instead of a 'decimal'.   Thank you!!