Transfering from Map62s to Map64s

I have a number of archived tracks on my 62s which has a broken USB connection. I have transfered them wirelessly to the 64s.
It does not recognise them for some reason.
I have used explorere to shift the tracks to my Data disk under Windows 7.
I can open the GPX files in Google Maps Google Earth, GPX Editor etc, bit not with Basecamp which is where I need them.
Has anyone any experience with solving this issue?