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In the context-sensitive menu in the Projects window, I suggest you change the Files/folders... item name to something like Other... or All templates... As a newbie I couldn't work out how to insert a template which wasn't on the default list. Got sorted through the experts in the nbusers mailing list, who agreed that the name was confusing.
This is part of projects UI, reassigning...
Jano?
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss