The "death" of this specific tool came when MetaQuotes completely overhauled the compilation process. Newer versions of MT4 began compiling code into pure machine instructions rather than byte-code. The Old Way:
Compiled Executable file. It is encrypted and unreadable to humans.
EX4 to MQ4 Decompiler 4.0.432.16: An In-Depth Guide to MetaTrader 4 Reverse Engineering ex4 to mq4 decompiler 4 0 432 16
If you do not own the rights to the EA, decompiling it is considered a violation of the developer’s intellectual property rights.
In early 2014, MetaQuotes released Build 600, which fundamentally overhauled the MQL4 language. It brought MQL4 structurally closer to MQL5 and C++, introducing strict typing, object-oriented programming (OOP), and a brand-new compiler. Crucially, this update introduced advanced encryption and obfuscation to compiled .ex4 files. The "death" of this specific tool came when
An .mq4 file is the original source code. It contains the logic, input parameters, trading rules, and technical indicators. Having the MQ4 allows a trader to modify, debug, or learn from the code.
Re-distributing or selling modified code that was originally compiled by another developer is illegal in many jurisdictions. It is encrypted and unreadable to humans
This dilemma is exactly why the phrase remains a highly searched term online.
