Hi Auto throttle,
The NEK expands the available selection of countires in CFS3 from 3 to 16 (I think from memory).
You dont need it if you happy for say Italian planes to reside in the German list of aircraft, or Australian planes to be in the USA list of planes.
The barracudda works as it should as its linked to one of the stock CFS3 countries (britain). others will be displayed as described above.
the AvHistory weapons pack, this is a must have, with out them your game will lock up when you go to use a weapon on a given plane that is not in your stock CFS3 weapons folder.
If you dont have the Avhistory weapons pack, you could copy the following folders from your ETO install into your Stock install:
weapons
guns
pylons
The ETO has all the AvHistory weapons included, but they are refined, more detailed textures, included some textures that were missing from the AvH set. etc etc
hope this helps,
regards Rob.