Opens a file like object for reading for the given relpath.
        
        :param      relpath | <str>
        
        :return     <File> || <QFile> || None

def load(self, relpath, rsc=None, mode='r', useFilepath=None):
        """
        Opens a file like object for reading for the given relpath.
        
        :param      relpath | <str>
        
        :return     <File> || <QFile> || None
        """
        filepath = self.find(relpath, rsc, useFilepath=useFilepath)
        
        # parse a resource object
        if filepath.startswith(':'):
            return QtCore.QFile(filepath)
        
        # parse a filepath
        elif os.path.isfile(filepath):
            return open(filepath, mode)
        
        # return an unknown object
        else:
            return None