I want to port some sounds over from The Phantom Menace PC game to use in my boonta eve map. Is this legal? I assume it is because these are both LucasArts games but I just don't want to get in any trouble for it.
Technically, yes, but if you want my opinion, the Filefront Team's lax reviewing style has really shown itself lately. You could probably get away with it if you tried, and in reality, LucasArts isn't trolling this site, looking for a reason to sue. They're too focused on other games now.
Having been on the site for a while, I've seen that there are several other files that contained ported content that remain on the site, and nobody's gotten in trouble. Fact of the matter is: if you're not looking to profit financially from it and you keep your head down, you'll be fine.
If you want to be safe, just throw in the necessary credits. The worst case scenario is that you'll be forced to resubmit with new music, but I don't see that happening.
Hopefully that answers your question. I figured it was best that someone who was actually in the review game and aware of the situation said something. No need to really pull out law books here. Just common sense. In the end, it's your judgement call.