Blocks: Custom blocks that can be used in the map editor. Blocks saved by the Mesh Modeler are also placed here.
Config: Configuration files for your profile and game.
Editors
ItemCollections
Items: Custom items that can be used in the map editor.
LogCrash: If your game crashes, a log will be generated here.
Maps: This is where all user-created tracks are created. It has a few important sub-folders.
Autosaves: The track editor automatically creates backups of your track while you create them, this is where they are placed.
Downloaded: Any track you download from ingame is placed here.
Match Settings: These are the game mode and maplist settings used for local servers.
My Maps: The default folder that is used by the track editor when you save a map yourself.
Media: Custom media files like images, sounds, and music.
ColorGradings
Images
Manialinks
Musics
Painter
Sounds
MediaTracker
Modules
Packs
Painter
Profiles
Replays: This is where the replays of your runs are stored.
Autosaves: Your best replays are automatically saved and placed here if you have the option enabled (enabled by default).
Clips: Clips exported from the MediaTracker default to here.
MediaTrackerGhosts: Author ghosts and reference ghosts are saved here.
My Replays: Some manually saved replays end up here.
Replays: Some manually saved replays end up here.
ScreenShots: Screenshots are placed in this folder when you hit the screenshot hotkey F10. Screenshots and videos rendered in the MediaTracker are also placed here.
Scripts: Custom scripts and plugins for the editor.
EditorPlugins: Plugins saved here can be activated in the map editor in Plugins Mode.
MapTypes: Maniascript files for map types (saved to the map).
Modes: Maniascript files for game modes (independent from maps).
Skins: Custom car skins, track mods, horns etc.
Any: Images for signs.
Avatars
Crosshairs
Horns
Models: Where local car skins are located.
Stadium: Flag images, pillar skins, and mods go here.