KnownFolderDir returns the absolute path for the given known folder id, or returns an error if that is not possible.

LocalAppDataDir returns the absolute path for the current user's local application data directory.

RoamingAppDataDir returns the absolute path for the current user's roaming application data directory.

LocalAppDataID is the FolderID for the local application data folder.

RoamingAppDataID is the FolderID for the roaming application data folder.

FolderID is a representation of a known folder id UUID.