I'm currently working on a patch to add support for native file dialogs for windows users. It's worked out pretty well, and I'm almost finished. I have one slight problem though: parent windows.

In the GTK version, sp_file_open_dialog (in file.cpp) is called from inside FileVerb::Perform in verbs.cpp. But how is it possible to get the GdkWindow object of the windows in which the verb was invoked? If I have this I can add it as an extra parameter to sp_file_open_dialog, to enable both the GTK, and Win32 file dialogs to be correctly set as child windows of the document's window.