--- Synchronet setup --- 
Unzip to Synchronet BBS xtrn directory, e.g.:
C:\sbbs\xtrn\GalacticDynasty2

Configure door menu item:

Open SCFG > 
External Programs > 
Online Programs (Doors) > 
[menu name of choice, i.e. Games] > 
Available Online Programs... > 
press <END> to go to blank space > 
press <ENTER>

Fill prompts:
Online Program Name: Galactic Dynasty 2
Internal Code: GD2

Press <ENTER> on new menu entry and fill fields accordingly.

╔══════════════════════════════════════════════════════════╗
║                    Galactic Dynasty 2                    ║
╠══════════════════════════════════════════════════════════╣
║ │Name                       Galactic Dynasty 2           ║
║ │Internal Code              GD2                          ║
║ │Start-up Directory         ../xtrn/GalacticDynasty2     ║
║ │Command Line               GalacticDynasty2.exe %f      ║
║ │Clean-up Command Line                                   ║
║ │Execution Cost             None                         ║
║ │Access Requirements                                     ║
║ │Execution Requirements                                  ║
║ │Multiple Concurrent Users  Yes                          ║
║ │Intercept I/O              No                           ║
║ │Native Executable          Yes                          ║
║ │Use Shell / New Context    No                           ║
║ │Modify User Data           No                           ║
║ │Execute on Event           No                           ║
║ │Pause After Execution      No                           ║
║ │BBS Drop File Type         Mystic          DOOR32.SYS   ║
║ │Place Drop File In         Node Directory               ║
║ │Time Options...                                         ║
╚══════════════════════════════════════════════════════════╝

Press <ESC> until all the way out of the menu systems, and it will prompt to save.
Exit SCFG, and if logged into board, log out.
Wait a few minutes before logging in for cached Command Shell session to clear.