Security researchers from Hybrid Analysis often flag EX4 decompiler executables as malicious.

frequently warn that most "free decompilers" found online are actually viruses or malware designed to steal account credentials. Summary Table: Decompilation Potential Older EX4 (Build

: Following major MT4 updates, EX4 files are no longer simple bytecode but compiled programs, making them significantly harder to decompile. Current GitHub projects often focus more on disassembly

While these GitHub projects can be helpful, it's crucial to approach them with caution. Decompilation is not always 100% successful due to the nature of compilation and the loss of information during the process. Here are some points to consider:

This article provides a deep, factual, and safety-focused analysis of the EX4 to MQ4 decompilers found on GitHub in 2021, why most no longer work, and what you should do instead.