I think you're going to be out of luck. More info on the parent program is
here.
It sounds like its such a swiss-army knife application that there's nothing that'll easily open the file. The best you can ask for is if Scratchboard (the app in question) has an export or save as function. But since it has so many features I can't think of a format a similar app on the Mac could open. The best you seem to be able to do is export the file as a text file, but that requires the full version ($19.95) of the app.