Wrong default extension when opening saved file in example app

[GoogleCodeExporter]

Code responsible for opening files:

filename=tkFileDialog.askopenfilename(defaultextension='.tbleprj"',
                                                      initialdir=os.getcwd(),
                                                      filetypes=[("Pickle file","*.tbleprj"),
                                                                 ("All files","*.*")],
                                                      parent=self.tablesapp_win)

despite file default extension should be .tblprj

Original issue reported on code.google.com by lutnia.m...@gmail.com on 29 Jan 2013 at 8:52