I have been trying to find a solution to this for a few hours now and my Google foo is not doing the job.

I have a map editor, with a bunch of tiles. I want to serialize the entire Map class to a file for later loading, I can't for the love of me figure out how to get what every tutorial/blog/stackoverflow answer is talking about, the StorageDevice/StorageContainer.

Am I missing something here?

Even the code samples gave to me by my tutor asks for the StorageContainer:

public static void SaveHighScores(HighScoreData data, string filename)
{
    // Get the path of the save game
    string fullpath = Path.Combine(StorageContainer.TitleLocation, filename);
 
    // Open the file, creating it if necessary
    FileStream stream = File.Open(fullpath, FileMode.OpenOrCreate);
    try
    {
        // Convert the object to XML data and put it in the stream
        XmlSerializer serializer = new XmlSerializer(typeof(HighScoreData));
        serializer.Serialize(stream, data);
    }
    finally
    {
        // Close the file
        stream.Close();
    }
}

Where does File.Open start? Is it the root directory of the machine (User)?