Unity 3.5b6 building for OSX 10.5

Hi there,

I've moved from Unity 3.2 to Unity 3.5b6 and I can't make universal builds anymore as PPN support has been taken out. That's fine, but I was wondering what version of OSX it's targetting, because it seems different to what it was in 3.2.

The reason this is a problem for me is because I'm trying to make a Mac build for Steam, and their tools can't process the new Mac build, because it's for a different version of OSX than it's expecting.

My question is, can I pick which version of OSX Unity 3.5b6 will support? Is there a setting hidden somewhere that does this?

Thanks, Andrew