There is no direct option to save a file with a .csv file extension using TextEdit on Mac
- Save the file as plain text: Make sure to select menu: Format -> Make Plain Text.
- Now click Command ⌘ + S to save the file.
- Have plain text encoding as UTF-8 and uncheck: If no extension is provided, use "txt".
- Now give the file a name with a .csv extension: e.g. myfile.csv
- This will save the file in CSV format, if you have MS Excel or Sheets it will open the file in it.

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