When you load or save a project the Open project file dialog is activated and as you say the various target destinations are displayed in the left tabs icons. If you select each tap the physical folder path is displayed at the top.
You will see that Samples refers to the initial installed path for example
c:\Program Files\Visual Building\Projects
and you will see that Samples refers to the current user path for example
c:\Users\username\Visual Building\Projects
The first path can only be saved to if you have assigned Administrator privileges to the program, and can then be read by all users using your computer. The second path is only seen by the current active user on you computer. If you are the only user using your computer then this does not really matter, but these alternative paths are part of the Windows operation system and applies to all programs running Windows.
See also:
Where are my projects
Applies to all versions
