Jarmo: Don't remember. But it's easy enough to test.
You see your attack bonuses on your character sheet.. somewhere there.
So just equip two weapons and check the stats, then equip heavy armor and recheck.
Mind you, there still are penalties for dual wielding, so it's not a practical fighting style from the start,
if you like your hits connecting. 2-handed weapon might be the best bet most of the time anyway.
Looks like Engerek01 answered the question already, and after going back to the in-game description I need to remember not to try new (to me) games when I'm tired, heh.
Engerek01: It seems Dual Wield is a unique feat for Rangers where it grants the benefits of 2 Feats (Two weapon Fighting and Ambidexterity) but only when wearing Light Armor. In my game it says that it doesnt benefit when wearing Medium or Heavy Armor.
http://nwn.wikia.com/wiki/Ranger Although a ranger is automatically proficient with medium armor, many rangers prefer light armor as medium armor disables their dual-wield abilities. EDIT!!!: You should also keep 2 things in mind.
1. Using a light weapon (like dagger or short sword) in off hand decreases the penalty for BOTH main hand and off hand by 2.
2. Also, Off hand only receives HALF of the strength Damage Modifier bonus. So if you have 18 STR (thus +4), then your main weapon gets +4 Dmg while your left hand gets +2 Dmg.
EDIT 2: [url=http://nwn.wikia.com/wiki/Dual-wield_(feat)]http://nwn.wikia.com/wiki/Dual-wield_(feat)[/url])
Good to know. I'm getting a clearer idea of how I want to proceed now. I did try the recommended stats in the conversion document and it seemed the character was a bit more powerful than the same character in BG. Goblins in the OC died in one hit and I couldn't seem to miss with attacks. So, I may stick with something closer to what I had above, or just go with a more literal translation of his stats with an 18 STR instead of the suggested 23 STR.
Flynn