Now, opening a JSON file is not hard, however, it would make more sense to convert it to the Microsoft Excel (CSV) format for easier use. The question is, how does one convert a JSON file to Excel?

If the DAT file you're trying to open is text, you can convert the file into text in the Microsoft Excel program by first saving it as a CSV file.

You can use these free software and online converter too to convert GPX files to Excel (XLS/ XLSX) or CSV format using your PC.