Escape deck characters as necessary in suggested deck export path

aqt/exporting.py

@@ -2,6 +2,8 @@
 # License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
 
 import os
+import re
+
 from aqt.qt import *
 import  aqt
 from aqt.utils import getSaveFile, tooltip, showWarning, askUser, \
@@ -66,7 +68,11 @@ class ExportDialog(QDialog):
                     return
         else:
             verbatim = False
+
+            # Get deck name and remove invalid filename characters
             deck_name = self.decks[self.frm.deck.currentIndex()]
+            deck_name = re.sub('[/?<>\:*|"^]', '_', deck_name)
+
             filename = os.path.join(aqt.mw.pm.base,
                                     '{}.apkg'.format(deck_name))