while ( exttok.HasMoreTokens() )
                 {
                     wxString token = exttok.GetNextToken();
                     gtk_file_filter_add_pattern( filter, wxGTK_CONV_SYS( token ) );
                 while ( exttok.HasMoreTokens() )
                 {
                     wxString token = exttok.GetNextToken();
                     gtk_file_filter_add_pattern( filter, wxGTK_CONV_SYS( token ) );