(there's some other class for it in GTK4)
I had a quick look and the alternative listed `GTKFileDialog` says nothing about native dialogs.
I'll try to have a look at it if it would require many changes in Geany to migrate to this class.
It would need to be optional, but I think the checkbox from the windows native dialogs is still in Glade unless @eht16 got around to removing it ;-)