Sorry, in english only.
Maybe you have a solution by gpx format.
- Create a track (path) over the poygon (exactly the same points).
- Save as path.
- Right click on this path : placemark export as .gpx
- Then open with WordPad.
- You have the coordinates of all the points.
- Maybe the format of the coordinates is not exactly as you want but I think you can find converters on web.