It usually defaults to All Excel Files - change it to "All Files." Navigate to the location where the CSV file is stored and select it. Follow the Text Import Wizard to open the CSV. Usually ...
RouteConverter.com is another freeware to edit KML files in Windows 11/10. It lets you edit KML, KMZ, GPX, RTE, WPT, TRK, CSV, and some other GPS data files. In it, you can add, remove ...