decompile metatrader expert advisor

I have an MT4 expert advisor that includes an .ex4 and a .dll file. It is one EA but is comprised of four separate strategies. I need the EA decompiled so I can convert it to Strategy Trader format, then backtest and optimize the settings. Therefore I need to know the following: 1) In layman's terms, what is the trade logic behind the EA? 2) How does it enter and exit a trade? 3) What indicators does it use? 4) What are the settings for the indicators?