Save and done! You don't have to edit undertale.ini, but you will have to save in-game to see the main menu file name update. Changing the Spare Color: Make sure you game is closed. Open up file0 with Notepad or a similar program. Edit line 53 of file0. 0 = Yellow, 1 = White, 2 = Pink. Currently, files (after the Napstablook fight) use pink names.