bazzalisk

I've just downloaded this on Mac OS X 10.8 and when I start it up it brings up a modal open file pane, there's no indication of what kind of file it's looking for, but if I hit cancel or OK, it quits the programme, and it's not at all clear to me what it's looking for (certainly it doesn't seem to want me to point it at the KSP directory or anything that I can work out). Am I being very stupid here?