This one customizes the offered locations which are displayed
when you use the "Save As" option.To set your own choice of
folders there,navigate to :

- HKEY_CURRENT_USER\Software\Microsoft\Windows
\CurrentVersion\Policies\comdlg32\PlacesBar\

As i tested it there was no comdlg32 subkey.I needed to create it:
Right click in the left pane the subkey : Policies.Choose new , key ,
name it : comdlg32.Right click this key again and choose new , key ,
name it : PlacesBar

Now select the PlacesBar key and create in the right pane new
REG_SZ [String Value] entries.(right click , new , REG_SZ [String Value] )
Name them from Place0 to Place4. (5 entries should be created)
(Each entry stands for one location in the Places Bar)

Now doubleclick each new created entry and set it's value to the
path of your desired folders.

Note:It is enough to close registry editor when you are done.
Next time you use the "Save As" function,your folders will be there.