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To open gpx files in google earth you need to start google earth and use the file open option and choose gps file type from the drop down. Tick all three options which will be presented. Double clicking gpx files will not work.
Additionally you can import gpx files into google my maps.https://www.google.com/maps/d/edit?hl=en&mid=1kBShSLBpfn13cKVpFKJmstsHOA4&ll=46.94993098178483%2C-2.192180100000087&z=12
You can export it and import in to ride with GPS and there is a map function there (using the free account)
I've also read you can open the files in google earth, so might be something there.
I've found this out whilst trying and failing to resolve my own issue.