I have found how to access the default data directory (labview specific), but how can I access the system specific directories that are available in the 8.5 installer in my source code? I've searched upon this and can't find the answer. On example of such a directory is CommonAppDataFolder where configuration files can be stored to share between users.
If you want to use existing code, you can search the LAVA forums for "system folders" or something else along those lines, since there were some VIs posted there to do this.