Different types of data or extensions go into different subdirectories of the chosen main

OpenTTD directory:

	Config File:         (no subdirectory)

	Screenshots:         (no subdirectory)

	Base Graphics:       baseset                 (or a subdirectory thereof)

	Sound Sets:          baseset                 (or a subdirectory thereof)

	NewGRFs:             newgrf                  (or a subdirectory thereof)

	32bpp Sets:          newgrf                  (or a subdirectory thereof)

	Music Sets:          baseset                 (or a subdirectory thereof)

	AIs:                 ai                      (or a subdirectory thereof)

	AI Libraries:        ai/libraries            (or a subdirectory thereof)

	Savegames:           save

	Automatic Savegames: save/autosave

	Scenarios:           scenario

The (automatically created) directory content_download is for OpenTTD's internal use and

no files should be added to it or its subdirectories manually.

Notes:

	- Linux in the previous list means .deb, but most paths should be similar for others.

	- The previous search order is also used for NewGRFs and openttd.cfg.

	- If openttd.cfg is not found, then it will be created using the 2, 4, 1, 3, 5 order.

	- Savegames will be relative to the config file only if there is no save/