Matlab 2015b, i open matlab associated file,but matlab current path does not update to where the file is in?

when i double click on xx.m file and start matlab2015b, its current folder is still the default path. how should i fix this problem?

in help doc:MATLAB Startup Folder,i find the following discription:

Default Folder on Windows Platforms:
Double-click a file type associated with MATLAB
The folder in which the file resides is the startup folder. The userpath folder is automatically added to the search path.

i checked my setting in "On the Home tab, in the Environment section, click Preferences. Select MATLAB > General. "

i think it ok to set: Location based on MATLAB startup rules.

moreover, i check the matlabrc.m and startup.m file, cd function works in following context:

   if ispc,
            pathToBin = [matlabroot,filesep,'bin',filesep,computer('arch')];
            if isequal(pwd, pathToBin),
                cd (matlabroot);
            end;
   end;

and

if ~(ismcc || isdeployed || feature('isdmlworker')) && usejava('jvm')
    s = Settings;
    switch s.matlab.workingfolder.InitialWorkingFolder
        case 'last_folder'
            % Last folder
            loc = s.matlab.workingfolder.LastFolderPath;
        case 'custom_folder'
            % Specified folder
            loc = s.matlab.workingfolder.CustomFolderPath;
        otherwise
            % no op in default folder, other random string
            loc = '';
    end
    if(~isempty(loc))
        if (exist(loc,'dir') == 7)
            try
                cd(loc)
            catch exc
                warning(message('MATLAB:matlabrc:InitialWorkingFolderPermission', pwd));
            end
        else
            warning(message('MATLAB:matlabrc:InitialWorkingFolder', pwd));
        end
    end
    end

is there anyone who knows how matlab accomplished "The folder in which the file resides is the startup folder" ?

[Jan]

I do not know, how to solve this. In my opinion, starting an M-file by a double click in the file explorer of the operating system is a bad design at all, so I do not have this problem.