Attention: Please never open the CSV files prepared with Excel for making adjustments with Excel. For example, Excel gives line breaks more weight than quotes and brackets, and uses various import filters that have undesired effects. Unfortunately, Excel cannot read its own CSV format, and a template, that can barely be used, would be the result. Always save the template for the CSV file to make changes and corrections in it, and to export it once more as a CSV file.
Also, please avoid copying text files containing data via drag and drop to an Excel sheet, because then you would risk the document to be autoformatted. Always open a new Excel sheet and "import" the data via Data / Import External Data. Here, you can specify how the data should be formatted (column by column, separated with a semicolon, and providing formatting for every column as text).