FileHandle OpenNotesFile()

Description	Opens the Design Notes file associated with the specified file, or creates one if none yet exists.
Arguments	const char* localFileURL, {BOOL bForceCreate}
	The first argument is a string containing the path to the main file with which the Design Notes file is associated, expressed as a file:// URL. The second argument is a Boolean value indicating whether to create the Design Notes file even if Design Notes are turned off for the site or filePath is not associated with any site.