converting arbitrary application to application bundle

Hi all,
please, is there any simple way to convert arbitrary application to a bundle?

In case of applescript application, it is possible to open it in script editor (using tell application block) and save it as a bundle.
But in case of other application I’ve no idea how to do it simple. I’m even not sure if it is possible.(The application could have resources, and maybe it will not find them if we save them into bundle.)

Any ideas?

Thanks

Josef Andrysek