If you want to show a GUI-Jabaco Sourcefile on other systems then Windows. Or you want to see a GUI file without installing Jabaco on an computer, then it is now possible.
Download this file:
FormViewer.jar
It is an executable jar-file.
You can start it with
java -jar FormViewer.jar
in a console. Or double click on it in the Exlorer of Windows.
After that cliock in the menu "File" -> "Open...".
Navigate to the directories and files to a Jabaco-Sourcecode file with GUI (a Form, Applet, etc. Not a Module or Class file).
For example choose from the Jabaco Samples in the directory "Calculator" the file "frmMain.jsrc".
Then it looks like on that attached screenshot.
I am sorry, that it is still buggy. But I am not a developer.