I know there are some smart folks that can open it up. I have a local Junior that had his longest ride ever get corrupted. In the days of Strava....this is heart breaking.
I have tossed a couple of the online tools I have used in the past at it and they all seem to fail. Usually, this is the case if the file is really small and there is no data. This one seems to have 888kb so think the data is there. Golden Cheetah shows corrupt headers.
If anyone has a bit more magic, this would help a Junior smile.
www.dropbox.com/.../Calum.fit