For importing UTF-8 encoded csv files into Excel 2013 (Windows):
- Open a new Excel worksheet
- On the 'Data' tab, select 'From Text' in the 'Get External Data' section
- Select the file to import
- On the first step of the Import Wizard, selected 'Delimited' and 'File origin': '65001: Unicode (UTF-8)'
- For the second step, set the delimiter to a comma.
- Click finish and insert into the existing worksheet.