Trouble converting 7z to iso in order to use in Crossover Games...

So, a friend gave me a CD-r that had a 7z archive of a game for Windows. I'd like to run it in Crossover Games, but I need to be able to mount it first. Is there an app that converts 7z archives to, say, iso or dmg? Or is that not possible with 7z?

Thanks.

Alex

p.s. if there's an easier way to do this in Crossover, that'd be great too... I just didn't want to make two posts in two different places.