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My (UK) maps are in \Storage Card\Great_Britain-map and this directory contains a number of files, viz:
cline.dat
cname.dat
cnode.dat
faces.dat
Great_Britian-24a02c86.mac
Great_Britian-Map.cfg
Great_Britain.mid
Great_Britain.pna
mapinfo.dat
poi.dat
tmccodes.dat
traffic.dat
traffic.inc
However, I seem to recall having a similar problem when I first set up TTN3: it kept saying that no maps had been installed when I *knew* they had been. It was a while ago and I can't remember the exact fix. I think it was to do with the Wizard not working properly. Once I abandoned that and set up a shortcut to access the TomTom Navigator.exe file directly, everything suddenly worked fine.
Do try contacting TomTom (via their website is best). Their support team aren't always super quick, but in my experience they do keep trying until you have a working system.
All the best.
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