When you've entered all your data into Notepad, save your file as a text document and change its file extension to ".csv." Although CSV documents consist of ordinary text, Microsoft Excel doesn't ...

Yes, you can open CSV files in Notepad on Windows 11/10. Notepad displays the content as it should be. In other words, you can find comma-separated data on your screen.

Taking this into account, if you’ve mistakenly changed csv to css, Windows may use Notepad to read the file. When you try to open an Excel file, make sure the file’s icon matches the file type.