Using Flash.pdf
In Macromedia Flash MX Professional 2004, you can use Flash Projects to manage multiple document files in a single project. Flash Projects allow you to group multiple, related files together to create complex applications.
You can use version-control features with projects to ensure that the correct file versions are used during editing, and to prevent accidental overwriting. To use version control, you must first add files to a project.
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http://download.macromedia.com/pub/documentation/en/flash/mx2004/using_flash.pdf