Instead of decompiling, attach a DLL proxy that logs every call to built-in functions. This reverse-engineers the behavior , not the code.

This guide breaks down the technical reality of EX4 files, why automated decompilers fail, and how to safely solve your coding problem. What Are EX4 and MQ4 Files?

If you have lost your MQ4 source code, or need to replicate the functionality of an old binary file, stop looking for decompilers. Use these clean-room development strategies instead: Reconstruct the Logic via Reverse Engineering

Files compiled on modern MT4 versions (build 600 and higher) are considered practically impossible to fully decompile because they generate binary code rather than simple byte code.

Repositories that primarily enable copyright infringement can be removed. Microsoft (GitHub owner) complies with DMCA takedowns. Several ex4 decompiler repos have disappeared in 2022–2024.