Your .ex4 file located in the MT4 MQL4/Experts folder. Installation Steps

Machine-readable bytecode executed by the MT4 platform.

The pursuit of an EX4 decompiler is fraught with significant risks, both technical and ethical.

Let's walk through using the Ex4ToMq4 decompiler (the most reliable option).

This arms race means that public GitHub decompilers often fail on any EX4 compiled with build > 1350 (MetaQuotes added heavy anti-reverse engineering in 2021).

Searching for "ex4 decompiler github" immediately raises red flags. Here is the hard truth:

There are legitimate, educational repositories on GitHub aimed at understanding the MQL4 virtual machine. These are often written in Python or C++. They attempt to parse the header of an .ex4 file or disassemble the bytecode into assembly-like instructions rather than high-level MQL4 code.

This is the most critical section. Just because a tool is on GitHub does mean using it is legal.