Backtest in MT4 with custom created symbols

I would like to download EOD stock data from yahoo or google finance. then use that data to backtest in Metatrader 4 the program would have to allow for custom symbols to be added to MT4 (update the [login to view URL] file) for backtesting MT4 is using FXT files , the program would need to create these based on the EOD data from yahoo program would also need to prevent MT4 from overwriting the FXT files some solutions exist already like tickstory or birt's tick data, but that is to import from dukascopy not yahoo... Ideally I would like to import any csv file into an FXT