To open the gpx link on a PC, save the file in a preferred folder then using your ride planning program, import your saved gpx file.
To open the gpx link on iPhone, tap the button in the top right of the screen and select your ride planning app.
To open the gpx link on android phone, your phone should automatically suggest using your ride planning app.
This list should be used in conjunction with the "Past Season's Rides" list on the previous page.