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The safest and most reliable way to get an MQ4 version of an EX4 file is to reverse-engineer its behavior rather than its code.
: The information in this article is provided for educational and research purposes only. Decompiling EX4 files for which you do not own the original source code is illegal in most jurisdictions and violates MetaTrader’s terms of service. The author and publisher assume no responsibility for any misuse of this information. Always obtain proper permission before attempting to reverse‑engineer any software.
: Various software tools are available online that claim to decompile EX4 files. The effectiveness of these tools varies, and some may not produce readable or fully functional MQ4 code.