Thanks for the hint and facts. I've corrected the misspelling.
I think that at the moment there is no way to add a real extension to LayOut as you are used to have in SketchUp, that's the reason for working upon the file...
You forgot to mention the professional design and marketing skills of the account owner
I haven't intended to hurt any conventions with my utility, fb site or this topic. If you have suggestions how to make it better, please share.