Seems that Sygic Teleatlas 2011.03 Maps (not the link in 1st post which is Sygic Truck) work OK with N900 MM10. I just replaced old files with a new ones. Tested with Fin, Swe, Est maps.
It might be that MM10 (N900 version) cannot understand cam and nhs files. At least I couldn't find any possibility to use those.

This is just for education purpose, of cource

EDIT: Only upi files (POI) seems to work, not nhs.