Thanks for the info.

Dang, that's unfortunate. I was really wanting to get items in some chests in a ruin, but could not do so because of that "cannot open enemy structures" thing.

Is there a way to get those items that I am overlooking?

Playing with the Ruins Mod, and I love it.

But I cannot get the Claim Ruins tool to work. Shift-C brings up an icon for it with a 1 in the lower left corner but I cannot figure out how to actually claim any enemy ruin structures with it.

Mods: Alien Biomes, Cold Biters, Explosive Biters, Bobs (everything), Qatavin's More Stuff, and probably a few more small things. Settings: Railworld, Biters still expand but slower, starting area 160%, expensive recipes, research cost to x16. Research rates are way too fast in vanilla. I may set it...