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diff --git a/zenmap/radialnet/gui/SaveDialog.py b/zenmap/radialnet/gui/SaveDialog.py
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+++ b/zenmap/radialnet/gui/SaveDialog.py
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+# vim: set encoding=utf-8 :
+
+# ***********************IMPORTANT NMAP LICENSE TERMS************************
+# *
+# * The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
+# * Project"). Nmap is also a registered trademark of the Nmap Project.
+# *
+# * This program is distributed under the terms of the Nmap Public Source
+# * License (NPSL). The exact license text applying to a particular Nmap
+# * release or source code control revision is contained in the LICENSE
+# * file distributed with that version of Nmap or source code control
+# * revision. More Nmap copyright/legal information is available from
+# * https://nmap.org/book/man-legal.html, and further information on the
+# * NPSL license itself can be found at https://nmap.org/npsl/ . This
+# * header summarizes some key points from the Nmap license, but is no
+# * substitute for the actual license text.
+# *
+# * Nmap is generally free for end users to download and use themselves,
+# * including commercial use. It is available from https://nmap.org.
+# *
+# * The Nmap license generally prohibits companies from using and
+# * redistributing Nmap in commercial products, but we sell a special Nmap
+# * OEM Edition with a more permissive license and special features for
+# * this purpose. See https://nmap.org/oem/
+# *
+# * If you have received a written Nmap license agreement or contract
+# * stating terms other than these (such as an Nmap OEM license), you may
+# * choose to use and redistribute Nmap under those terms instead.
+# *
+# * The official Nmap Windows builds include the Npcap software
+# * (https://npcap.com) for packet capture and transmission. It is under
+# * separate license terms which forbid redistribution without special
+# * permission. So the official Nmap Windows builds may not be redistributed
+# * without special permission (such as an Nmap OEM license).
+# *
+# * Source is provided to this software because we believe users have a
+# * right to know exactly what a program is going to do before they run it.
+# * This also allows you to audit the software for security holes.
+# *
+# * Source code also allows you to port Nmap to new platforms, fix bugs, and add
+# * new features. You are highly encouraged to submit your changes as a Github PR
+# * or by email to the dev@nmap.org mailing list for possible incorporation into
+# * the main distribution. Unless you specify otherwise, it is understood that
+# * you are offering us very broad rights to use your submissions as described in
+# * the Nmap Public Source License Contributor Agreement. This is important
+# * because we fund the project by selling licenses with various terms, and also
+# * because the inability to relicense code has caused devastating problems for
+# * other Free Software projects (such as KDE and NASM).
+# *
+# * The free version of Nmap is distributed in the hope that it will be
+# * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Warranties,
+# * indemnification and commercial support are all available through the
+# * Npcap OEM program--see https://nmap.org/oem/
+# *
+# ***************************************************************************/
+
+import gi
+
+gi.require_version("Gtk", "3.0")
+from gi.repository import Gtk
+
+import os.path
+import radialnet.gui.RadialNet as RadialNet
+import zenmapGUI.FileChoosers
+
+from zenmapGUI.higwidgets.higboxes import HIGHBox
+from zenmapGUI.higwidgets.higdialogs import HIGAlertDialog
+
+
+TYPES = ((_("By extension"), None, None),
+         ("PDF", RadialNet.FILE_TYPE_PDF, ".pdf"),
+         ("PNG", RadialNet.FILE_TYPE_PNG, ".png"),
+         ("PostScript", RadialNet.FILE_TYPE_PS, ".ps"),
+         ("SVG", RadialNet.FILE_TYPE_SVG, ".svg"))
+# Build a reverse index of extensions to file types, for the "By extension"
+# file type.
+EXTENSIONS = {}
+for type in TYPES:
+    if type[2] is not None:
+        EXTENSIONS[type[2]] = type[1]
+
+
+class SaveDialog(Gtk.FileChooserDialog):
+    def __init__(self):
+        """
+        """
+        super(SaveDialog, self).__init__(title=_("Save Topology"),
+                action=Gtk.FileChooserAction.SAVE,
+                buttons=(Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
+                    Gtk.STOCK_SAVE, Gtk.ResponseType.OK))
+
+        types_store = Gtk.ListStore.new([str, object, str])
+        for type in TYPES:
+            types_store.append(type)
+
+        self.__combo = Gtk.ComboBox.new_with_model(types_store)
+        cell = Gtk.CellRendererText()
+        self.__combo.pack_start(cell, True)
+        self.__combo.add_attribute(cell, "text", 0)
+
+        self.__combo.connect("changed", self.__combo_changed_cb)
+        self.__combo.set_active(0)
+
+        self.connect("response", self.__response_cb)
+
+        hbox = HIGHBox()
+        label = Gtk.Label.new(_("Select File Type:"))
+        hbox.pack_end(self.__combo, False, True, 0)
+        hbox.pack_end(label, False, True, 0)
+
+        self.set_extra_widget(hbox)
+        self.set_do_overwrite_confirmation(True)
+
+        hbox.show_all()
+
+    def __combo_changed_cb(self, widget):
+        filename = self.get_filename() or ""
+        dir, basename = os.path.split(filename)
+        if dir != self.get_current_folder():
+            self.set_current_folder(dir)
+
+        # Find the recommended extension.
+        new_ext = self.__combo.get_model().get_value(
+                self.__combo.get_active_iter(), 2)
+        if new_ext is not None:
+            # Change the filename to use the recommended extension.
+            root, ext = os.path.splitext(basename)
+            if len(ext) == 0 and root.startswith("."):
+                root = ""
+            self.set_current_name(root + new_ext)
+
+    def __response_cb(self, widget, response_id):
+        """Intercept the "response" signal to check if someone used the "By
+        extension" file type with an unknown extension."""
+        if response_id == Gtk.ResponseType.OK and self.get_filetype() is None:
+            ext = self.__get_extension()
+            if ext == "":
+                filename = self.get_filename() or ""
+                dir, basename = os.path.split(filename)
+                alert = HIGAlertDialog(
+                        message_format=_("No filename extension"),
+                        secondary_text=_("""\
+The filename "%s" does not have an extension, \
+and no specific file type was chosen.
+Enter a known extension or select the file type from the list.""" % basename))
+
+            else:
+                alert = HIGAlertDialog(
+                        message_format=_("Unknown filename extension"),
+                        secondary_text=_("""\
+There is no file type known for the filename extension "%s".
+Enter a known extension or select the file type from the list.\
+""") % self.__get_extension())
+            alert.run()
+            alert.destroy()
+            # Go back to the dialog.
+            self.emit_stop_by_name("response")
+
+    def __get_extension(self):
+        return os.path.splitext(self.get_filename())[1]
+
+    def get_filetype(self):
+        filetype = self.__combo.get_model().get_value(
+                self.__combo.get_active_iter(), 1)
+        if filetype is None:
+            # Guess based on extension.
+            return EXTENSIONS.get(self.__get_extension())
+        return filetype