A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
The user who sees the "wrong one" probably uses comma as decimal separator and semicolon as list separator.
Therefore the commas in the CSV files are not interpreted as delimiters.
She could open the file as a text file (press Ctrl+O, select Text Files as file type). She should then be able to specify comma as delimiter.
Or change the system separators.