For those that can afford to convert a few files manually, there are some answers here mentioning on how to convert them with Notepad++, but I wanted to add the solution with VS Code (Visual Studio Code / VSCode):
- Open the CSV file in VS Code
- In the bottom bar, click in the encoding (in my case, is the 4th from the right: "UTF-8" , "LF", "Plain Text" , notifications bell). If you hover over it, it will show "Select Encoding". If you can't find it, the alternative is to click on VS Code "Help" menu (top bar) -> "Show All Commands" -> type "Change File Encoding"
- It will open a list of actions in the top bar. Click "Save with Encoding"
- It will open a list of possible encodings. Click in the one you want, and you are good to go, open it in Excel and display the correct characters there. In my case, I selected "UTF-8 with BOM", which worked in Excel 365 ("Excel for Microsoft 365 MSO (Version 2311)")