Part 1 of issue 4276. I principle same patch as for branch, but adapeted to trunk.

svn: r15959

src/plugins/export/ExportPkg.py

@@ -159,8 +159,7 @@ class PackageWriter(object):
                 pass
 
             def fs_ok_clicked(obj):
-                name = unicode(fs_top.get_filename(),
-                               sys.getfilesystemencoding())
+                name = Utils.get_unicode_path_from_file_chooser(fs_top.get_filename())
                 if os.path.isfile(name):
                     archive.add(name)