It would be nice if the launcher would register the given file extensions with the ftype and assoc commands.
(Or as an alternative, let the user run a custom batch file in addition to the JVM execution.)
the issue was copied to http://code.google.com/p/jliftoff/issues/list
closing as invalid at http://code.google.com/p/jliftoff/issues/detail?id=46. Out of scope for this project.