From How to make a Mac OS X .app with a shell script? I recently learned of a hack for creating a .app file from a file folder which contains an application with resources.
The top folder is given the same name as a bash script in the top level of the folder system, except the folder name also includes .app.
What I'm wondering, though, is if it possible to set this .app to display an icon that I provide when the file is seen via the Finder? Or can this only be done by making my folder system a Bundle?