You can only have one project file open at a time. If you already have a file open that contains unsaved changes, you will be prompted to save changes before opening another project.
To open an existing .jmb file for viewing and editing:
1. Choose Open... from the File menu or click on the Open Project button.
The Open dialog box appears. The Files of Type field is set up to show . jmb files. For detailed information on using the Open dialog box, see Appendix A: Common Dialog Boxes.
2. Go to the project's directory name and find the desired . jmb filename.
3. Choose OK.
The Project window appears with thumbnails of the pages that make up the application.
4. Double-click on the thumbnail of the page.
The selected page opens within Jamba's Page Layout editor.