B4J Question B4J 9.00 XUI.DefaultFolder

Hi Erel, All.
In the release of version 9.00 i read:

File.DirData / XUI.DefaultFolder on Mac point to ~/Library/Application Support/[AppName] where AppName is the value set with XUI.SetDataFolder. This is similar to the behavior in Windows.
It is required when running packed apps.

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Can you please explain better.
What does "is required when running packed apps" mean.
For example for Mac I use all packed projects (dmg / app), which means that the variable XUI.SetDataFolder must be set
Thank you
Marco