Где хранить файлы .desktop Nautilus-Actions?

from gi.repository import Nautilus, GObject
import os, os.path
from urllib import unquote

PROGRAM_NAME = '/path/to/the/program/you/want/to/run/with/the/files/selected'

class MyExtension(GObject.GObject, Nautilus.MenuProvider):
    def __init__(self):
        pass

    def action_for_my_files(self, menu, files):
        # This is the method invoked when our extension is activated
        # Do whatever you want to do with the files selected
        if len(files) == 0:
            return

        names = [ unquote(file.get_uri()[7:]) for file in files ]

        argv = [ PROGRAM_NAME ] + names

        GObject.spawn_async(argv, flags=GObject.SPAWN_SEARCH_PATH)

    def get_file_items(self, window, files):
        ''' This method is invoked to create a contextual menu.
            We can filter out the files, directories we do not want a menu
        '''

        '''No files selected -> no menu'''
        if len(files) == 0:
            return

        for fd in files:
            ''' Not a file -> no menu '''
            if fd.is_directory() or fd.get_uri_scheme() != 'file':
                return
            ''' Not an image -> no menu '''
            if not fd.is_mime_type("image/*"):
                return

        item = Nautilus.MenuItem(name='MyExtension::MethodUniqueId',
                                 label='Label in the menu...',
                                 tip='Tip for the menu',
                                 icon='icon_name')
        item.connect('activate', self.action_for_my_files, files)

        return item,

Для Nautilus 2 начало сценария примерно такое же. Вам нужно только изменить начало. Для предыдущего примера это будет:

import gobject, nautilus
import os, os.path
from urllib import unquote

PROGRAM_NAME = '/path/to/the/program/you/want/to/run/with/the/files/selected'

class PostrExtension(nautilus.MenuProvider):
...