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– Decompiling .ex4 files without the original author’s permission typically violates the software's terms of service and intellectual property laws. Most expert advisors (EAs) and indicators are sold as compiled products specifically to protect the developer’s source code.

Even if the decompiler works, the resulting MQ4 code often lacks variable names (replacing them with g_var1 , g_var2 , etc.), making it nearly impossible to understand or modify the logic. Ethical and Legal Considerations

The recovered source code can now be modified, compiled, and used as needed.