Yes, I'm pretty sure it's legal. I remember there was a thread about a mod that used map resources from another non ie game. I think it was @Dee who said that it's ok to use resources from other ie game, but we can't use resources from non ie games (at least on this forum). So that was a confirmation from the devs themselves. In the resource pack thread, this topic is also mentioned. And btw, I don't think Atari holds anything BG related since it went bankrupt. In the latest beta of BG:EE they even removed their logo from the intro.
Are you talking about the link in the first post? That link is dead because the forum changed names/domain but the post with the download file is still there:
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And btw, I don't think Atari holds anything BG related since it went bankrupt. In the latest beta of BG:EE they even removed their logo from the intro.
https://forums.beamdog.com/discussion/comment/504471/#Comment_504471