There are limited circumstances where decompilation may be legally permissible:
If you own the EX4 (e.g., you wrote it but lost the MQ4), you can:
MetaQuotes 4 (MQL4) is a programming language used for developing trading strategies, technical indicators, and automated trading systems (EAs) for the MetaTrader 4 platform. The MQL4 compiler converts the mq4 code into an ex4 file, which is a binary format that can be executed by the MetaTrader 4 platform. Ex4 To Mq4 Decompiler Github
The repository contains command-line interface (CLI) wrapper code designed to interact with a separate decompilation executable called ex4_to_mq4_demo.exe . The original decompiler link referenced in its documentation pointed to http://forexstay.com/download/ea/Ex4%20Decomplier%20(ex4%20to%20mq4)/ , but this link no longer works. The repository has been archived by its owner since September 2020 and is now read-only.
The quest for an is one of the most persistent searches in the MetaTrader community. Whether you’ve lost the source code to an old Expert Advisor (EA) or you're trying to understand the logic behind a "black box" indicator, the need to reverse-engineer these files is common. There are limited circumstances where decompilation may be
Always ensure you have the explicit permission of the original developer before attempting to decompile an EX4 file. Safe Alternatives to Decompilation
Here is a comprehensive breakdown of what happens when you look for an EX4 decompiler on GitHub, why most automated claims are false, and how to safely navigate the situation. Understanding the EX4 vs. MQ4 Ecosystem The original decompiler link referenced in its documentation
Most, if not all, commercial EAs prohibit reverse engineering in their End User License Agreements (EULA).
// Original had: custom variable names, error handling, comments, etc.