I didn't say that a front end gui wasn't useable... just mentioning the fact that this is all that the program is currently, when there was no hint of it being just a front end for the existing commandline tools. I would hope that Josh would have gotten some cut for any money made on this if you kept it as a sellable item, since its his tools actually making the conversions. I actually think a front end GUI is an extremely nice idea, but having to DL 40MB of .NET seems to be a bit much.
Also, a simple cfg text file would suffice for saving the LE SDK path; there's no reason to write stuff to the registry if all you are saving is the SDK path.