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.