Thank you, Wikiwide for your answer.

My python version on the phone is 2.5.4, so it should not be a problem, as the GTK version of the script runs just fine.

I use FileChooserDialog in both scripts; set_select_multiple is the option connected only to FileChooserDialog.
I could use gtk.FileChooserDialog - as you see in the attached script -, but in that way I will miss the "hildonish" look, as it opens a gtk window with small fonts, etc (as you can see if you run the script). That is why I wrote that the GTK version is working, but the Hildon version doesn't.

Hildon File Selection was my thought too, but it doesn't work either (or I don't use it in the right way...?), because as I saw these are two different things and I cannot bind them together.

Cheers,

jm