Top Myths About EX4 to MQ4 Decompilers (Debunked)
The world of MetaTrader programming is full of misinformation—especially when it comes to EX4 to MQ4 decompilers. Many traders believe these tools can easily turn compiled EX4 files back into clean, editable MQ4 source code.
The reality is far more complex.
Decompilation is a technically difficult, legally sensitive, and often misunderstood process. In this article, we debunk the most common myths about EX4 to MQ4 decompilers, explain what they can really do, and help you set realistic expectations.
Key Takeaways
Understanding EX4 and MQ4 Files in MetaTrader
Before tackling the myths, it’s important to understand the basics.
What Are MQ4 Files?
MQ4 files are source code files written in MQL4, the programming language used to build:
They are human-readable, editable, and contain the full logic of a trading strategy.
Structure of MQ4 Source Code
Typical MQ4 files include:
What Are EX4 Files?
EX4 files are compiled versions of MQ4 files. The MetaEditor compiler converts source code into a machine-readable format that MetaTrader can execute.
What Happens During Compilation?
This process protects the developer’s intellectual property.
The Role of EX4 to MQ4 Decompilers
EX4 to MQ4 decompilers attempt to reverse the compilation process, turning EX4 binaries into code that resembles MQ4.
They are commonly used for:
But this brings us to the myths.
Myth #1: EX4 to MQ4 Decompilers Are Always Illegal
Reality: Not always—but often.
Decompilation laws vary by country. In some jurisdictions:
However, most commercial EAs are protected by:
👉 Decompiling without permission is often illegal, even if decompilation itself isn’t universally banned.
Myth #2: Decompilers Can Perfectly Restore the Original MQ4 Code
Reality: This is impossible.
During compilation:
What Decompiled Code Is Missing
Decompiled code may compile, but it will never be identical to the original.
Myth #3: All EX4 Files Can Be Decompiled Successfully
Reality: Many cannot.
Factors That Affect Decompilation Success
Protection Methods Used Today
|
Technique |
Effectiveness |
|
Code obfuscation |
High |
|
Encryption |
High |
|
Anti-debugging |
Mediu |
Modern EX4 files are specifically designed to resist decompilation.
Myth #4: Decompilers Are Only Used for Piracy
Reality: Not always.
Legitimate Use Cases
The problem arises when decompilation is used to:
Intent and permission matter.
Myth #5: Free Decompilers Are as Good as Paid Ones
Reality: Usually false.
Free Tools Often:
Paid Tools May Offer:
But even paid tools do not guarantee usable MQ4 code.
Myth #6: Decompiled Code Is Ready to Use Immediately
Reality: Almost never.
Common Issues After Decompilation
Developers often spend more time fixing decompiled code than rewriting it from scratch.
Myth #7: Newer MetaTrader Versions Have Stopped Decompilation Completely
Reality: Protection has improved—but not eliminated decompilation.
|
MetaTrader Version |
Decompilation Difficulty |
|
MT4 (Old builds) |
Easier |
|
MT4 (Build 600+) |
Hard |
|
MT5 (Latest) |
Very H |
There is an ongoing arms race between compiler protections and reverse engineering techniques.
Myth #8: Decompilers Reveal All Trading Secrets
Reality: They reveal very little context.
Decompilers may show:
But they cannot reveal:
Reconstructing a strategy still requires deep expertise.
Myth #9: Using Decompiled Code Is Risk-Free
Reality: It carries serious risks.
Technical Risks
Legal Risks
Security Risks
Myth #10: Decompilation Is the Only Way to Understand EX4 Files
Reality: It’s not.
Safer Alternatives
These methods are legal, safer, and often more accurate.
How Developers Protect Their MQL4 Code
Common Protection Techniques
Moving critical logic off-platform is one of the strongest defenses.
Conclusion: The Real Truth About EX4 to MQ4 Decompilers
EX4 to MQ4 decompilers are not magic tools. They:
Understanding their limitations helps traders and developers make smarter, safer decisions.
If your goal is learning, customization, or trust:
That path is faster, safer, and future-proof.