I talked to Magellan support about a similar issue with my Explorist 600 and MapSend DirectRoute.
Do you have a piece of software named "Conversion Manager". It should have come in the box with your Explorist. If not, it is downloadable from Magellan.
Anyway the support people said I needed to use the "Conversion Manager" as a go between. This software converts data on the Explorist unit to data that is usable by the "DirectRoute" program, in my case.
The options on the first screen are...
What do you want to do?
Convert Waypoints / Routes / Tracks
Transfer Map Regions
You select one or the other, and choose next.
Screen Two asks you to turn on your unit, a secure digital card reader will work too.
Screen Three says the following..
Convert to eXplorist (you have something on your PC to put on the eXplorist)
Convert to MapSend (you have something on the eXplorist to put on the PC)
again pick one or the other.
Screen 4 is a file transfer dialog box. You may have to try this out to see this screen. You pick a file to transfer and it does the appropriate conversion.
When I use MapSend I tried once to directly communicate with the eXplorist. No joy. That's where the conversion program comes into play
Hope this gives you some ideas.