Traders mistakenly assume that they need access to the source code to program an MQL indicator. New trading setup signals might save the user from staring at charts too long. A successful indicator may predict the direction of the market, yet it may not generate alerts when it’s a good time to trade. Many would be decompilers want to make harmless changes to a file. An expert advisor programmer can then take the MQL contents and make the desired changes. Breaking the compiled ex4 file yields an mq4 file. Most requests to decompile an ex4 file come from traders that purchased a commercial expert advisor and are not happy with the product. When the plays develop, the players take the generic game plan and implement it in real time. The idea is ready to go, even though the individual plays could not have been known because they were in the future. The ex4 file is the series of decisions made in the game that implement the plan to pass more often. The purpose is to develop a general response to a set of circumstances. You don’t know all of the specifics of how the game will play out. If you know that the opposing team’s defense moves slowly, you might try passing more frequently. The best analogy is to consider the idea of a game plan. If you open an ex4 file in the MetaEditor or in NotePad, all that comes up are wiggly characters and gibberish. Instead, it compiles the code into a series of zeros and ones, called bits, that the computer reads in real time. The computer does not save ex4 file information in human readable format. Programmers can access this file type in order to make changes to the EA or indicator. When you install an expert advisor, you may have noticed two different types of files listed in the experts or indicators folder.mq4 files hold the original programming code in the MQL language. The goal of decompiling is to access the original source in order to modify it in some manner. Decompiling a file means to break open the compiled source code to view the contents.

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