[dogscoff]

- Are AI files very different than in unmodded game ?

No, they are exactly the same as the unmodded game. TDM does not change the techs or any other aspect of the game: It just improves the AI for the standard game.

- What make races smarter with that mod ?

The same things that make the Ai smarter for the standard game.

- Does TDM AIs still working in unmodded game ?

Yes, see above.

(even if they are less efficient)

They aren't.

Perhaps you could attempt an AI for the P&N mod, seeing as it's a pirate shipset. That would be cool.