Config.ini

All workshop items have a config.ini file to indicate the type of it, as well as provide additional information. In the case that this file is configured incorrectly, the game might crash when loading the item and/or won't upload to the Steam Workshop. The properties in it differ depending on the type of workshop item.

Stages
The properties of stages can be edited through the in-game stage editor, or also manually from the  file. See Stages for the list of variables.