GamePart ids bound to a C++ class by the executable's own registration strings
(24 strings, 24 distinct ids)

    0  GamePart_Title
    3  GamePart_SaveLoad
    4  GamePart_SaveLoad
    5  GamePart_Extras
    6  GamePart_MovieTheater
    7  GamePart_MissionSelect
    8  GamePart_Options
    9  GamePart_Movie
   10  GamePart_Bunk
   11  GamePart_ReadyRoom
   12  GamePart_Hangar
   13  GamePart_Arsenal
   14  GamePart_PilotLog
   15  GamePart_System
   17  GamePart_MainGame
   19  GamePart_PauseMenu
   20  GamePart_StageClear
   21  GamePart_MissionLog
   22  GamePart_GameOver
   23  GamePart_Debriefing
   24  GamePart_Dialog
   25  GamePart_Tutorial
   26  GamePart_ChallengeMission
   27  GamePart_Leaderboard

ids 0..28 with NO registration string: [1, 2, 16, 18, 28]