The MT4 strategy tester reads tick data from files in the tester\history folder of the format AAABBBnn_0.fxt, where AAABBB is the currency pair, nn is the timeframe, and 0 means that the file was created using fractal interpolation. This 0 = fractal interpolation code is only correct if you generated it by checking "recalculate" in the strategy tester window. If you created it from your own tick data then it contains real tick data, and you should backtest using "recalculate" unchecked.

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I always say that backtesting is useless....well.... not any more!!!