Create new records and update existing records

Sugar (version 12.0.0)

Update existing records,

Have an excel file with 15000 records to be updated, saved this file as UTF-8 comma dilimited csv file.

When I try to update an error shows: 

The field delimiter and qualifier in the import file could not be detected. Please verify the settings in the Import File Properties.

Now I opened the same excel created  UTF-8 comma dilimited csv file in google sheets and dowloaded it again.

Using this file to update records and no problems!

My question is why does an excel created csv file give me errors and a google sheet created csv file doesn't 

Rick...