If you want to convert Google Earth KML files to Excel (XLS, XLSX) or CSV format, you can use these free converter software and online tools.

Learn how to import or export data from a Text file to convert a Text (.txt or .csv) file into an Excel (.xlsx) spreadsheet easily using this procedure.

You might think CSV files are just spreadsheets, similar to Excel files, but it's a lot more interesting than that: Open any CSV file in a text document and you'll learn that the "comma separated ...

A better tool for editing CSV files ModernCSV, an indie app for Linux, Mac, and Windows computers, is the best tool I've come across for this purpose.