If I blow the game up to 1600x900, will the view change in that I will see enemies and stuff I wouldn't normally see had I not changed the resolution? I want to play it as it was intended, but with the souped up resolution, if that's possible? Thanks

I think it shouldn't cause any problems. The largest resolution I've played it at is 1400x900, and that was fine. You definitely get a larger view than was intended, so you can see a lot more of the map than when I first played the game in 2001. But there aren't any secrets that you will break with a larger map.

what is the game's vanilla resolution? Thanks

I want to say 800x600. But don't quote me on that, I could be wrong.