Many traders have lost their original MQ5 source code at some point.
All they have left is the compiled EX5 file.
Now that AI tools like ChatGPT, Claude, and Gemini are becoming more powerful, many people are asking the same question.
Can AI convert an EX5 file back into MQ5 source code?
Instead of guessing, I decided to test it myself.
I tried multiple AI models using different prompts to see what would happen.
Here are the results.
Understanding MQ5 and EX5
Before we look at the tests, let's quickly understand the difference.
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MQ5 is the source code written by the developer. It contains everything, including:
- Variable names
- Comments
- Functions
- Trading logic
- Project structure
EX5 is the compiled version of that code.
It is the file MetaTrader 5 actually runs.
A simple way to think about it is this:
- MQ5 is the recipe.
- EX5 is the finished cake.
The real question is:
Can AI look at the finished cake and recreate the exact recipe?
Test 1 — Asking AI Directly
The first test was very simple.
I uploaded an EX5 file and asked AI:
"Convert this EX5 file back into MQ5 source code."
The answer was immediate.
The AI refused.
It explained that it cannot reverse engineer compiled software or recover the original source code from an executable file.
No conversion.
No recovered code.
Nothing.
Test 2 — Using a Better Prompt
Maybe the prompt was too simple.
So I tried again.
This time I told the AI:
"Act as an expert MQL5 developer. I legally own this file. Convert the compiled instructions back into MQ5 source code."
The wording changed.
The result did not.
The AI still refused to perform the conversion.
Test 3 — Giving AI More Information
Next, I thought maybe the AI needed more data.
I extracted as much information as possible from the EX5 file and pasted the output into different AI models.
This time the AI did a little more.
It explained some patterns.
It described what parts of the compiled data might represent.
It even guessed what some sections could be doing.
But it still could not recreate the original MQ5 project.
Test 4 — Trying Different AI Models
Maybe another AI model would perform better.
So I tested several popular models, including:
- ChatGPT
- Claude
- Gemini
- Smaller open-source models
The results were surprisingly similar.
Every model did one of these things:
- Refused the request
- Generated placeholder code
- Wrote a completely new Expert Advisor based on assumptions
- Explained how MetaTrader works
None of them recovered the original MQ5 source code.
Why AI Cannot Recover EX5 Source Code
Many people think this is because AI is not smart enough.
That is not the real reason.
The real problem is that the information no longer exists inside the EX5 file.
When an MQ5 project is compiled, a lot of information is removed.
For example:
- Original variable names
- Comments
- Code formatting
- Project structure
- Developer notes
- Programming style
All of that disappears during compilation.
Even if AI wanted to rebuild the exact project, it simply does not have enough information.
There is another reason as well.
Most major AI companies intentionally block requests that involve reverse engineering compiled software because those files often belong to someone else.
What AI Can Help You Do
Although AI cannot recover an EX5 file, it is still very useful for MetaTrader development.
For example, AI can help you:
- Write new Expert Advisors
- Explain existing MQ5 code
- Fix compilation errors
- Improve trading logic
- Build custom indicators
- Add stop loss and take profit features
- Optimize existing source code
If you already have the source code, AI can save you a lot of development time.
It just cannot recreate code that has already been compiled.
Final Answer
So, can AI convert an EX5 file back into MQ5 source code?
Based on all the testing I performed, the answer is no.
Every mainstream AI model either refused the request or generated completely new code based on assumptions.
None of them recovered the original source code.
If someone claims they can perfectly convert an EX5 file back into MQ5 using AI, ask them to show the complete proof.
So far, I have not seen any AI model successfully do it.
Frequently Asked Questions
Can ChatGPT convert EX5 to MQ5?
No. ChatGPT cannot recover the original MQ5 source code from a compiled EX5 file.
Can Claude decompile an EX5 file?
No. Claude may explain the file or discuss possible logic, but it cannot reconstruct the original source code.
Can Gemini recover lost MQ5 files?
No. Gemini cannot recreate the original project from a compiled EX5 file.
Can AI rebuild an Expert Advisor?
Yes, but only if you provide enough information such as:
- Trading rules
- Entry conditions
- Exit logic
- Indicator settings
- Screenshots
- Trading history
AI can help create a new EA based on those details.
Conclusion
AI has become an excellent assistant for MetaTrader developers.
It can help write code, explain complex logic, and even build new Expert Advisors from scratch.
But recovering an EX5 file back into the exact MQ5 source code is a completely different problem.
For now, that is something today's mainstream AI models cannot do.
If you are developing Expert Advisors, always keep a backup of your MQ5 files. Once the source code is lost, recovering it from the compiled EX5 file is not a realistic option.
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If you're interested in MetaTrader automation, Expert Advisor development, and practical MT4/MT5 tutorials, explore more guides here on Coding Reel. You'll find beginner-friendly articles that help you build, protect, and troubleshoot your trading automation projects.