Koiju

I seem to be utterly unable to view any of my own custome races, i even tried renaming one of them to terran and saving a back up of the original tech tree, it still wont view properly in the viewer Why is there no 'I want to open this tech tree *points to specific XML file*' option? I am very dissapointed in this viewer, it seems totally and utterly pointless to me, I get the same fuctionality out of just downloading the tech tree from the wiki o