The spine.cfg is an ini file placed in the base directory of the game and is required for games to work with Spine. It contains some basic configurations such as the executable to launch the game.
At the moment there is only the INFO section containing some basic configuration.
The executable to be started. Relative path to the project/download folder.
The name of the game to be displayed in the library.
Additionally you can also specify Title_<Language> for language specific titles. When available, the language specific title will be used and fall back to Title if no specific one exists.
The icon to be displayed in the library. Relative path to the project/download folder.
And here is an example spine.cfg we use for our Tri6: Infinite Demo.
[INFO] Title=Tri6: Infinite Demo Icon=Icon.png Executable=Tri6 Infinite Demo.exe