Thanks for your info but your link doesn't work...
I found this link:
[Please Register or Login to download file] I think is the same program.
I'll give it a look and I'll come back to tell
Edit:
Bad news
TDBChanger can't see gmaps only Family_XXX type (old-style). Any help to rename for instance City NAvigator Europe 2012.10 To CNE 2012.10 in Mapsource without downgrade to old style and then reUpgrade to gmap?