If it's a valid gpx file just copy it to the GPX folder on your 64.
Don't do what I did with mine and drop it on my first use of it, it fell face down on a sharp piece of rock and cracked my glass. So get one haha. Luckily it doesn't obscure the view on the screen.
It's an expensive bit of kit to break or lose so fit a lanyard long enough to use at arm's length but not long enough to reach the ground Regards Keith