Expert Advisors (EAs) and indicators for MetaTrader 4 are written in MQ4 (source code) and compiled into EX4 (executable).
Many websites offering "decompiler 5.0.1 exe" downloads are hubs for malicious activity: ex4 to mq4 decompiler50 1 exe hot
Build 600+ Compatibility: Since the release of MetaTrader 4 build 600 in 2014, the platform uses a much stronger compilation method that converts source code into native binary rather than byte code. Most legacy decompilers cannot process these modern files. Expert Advisors (EAs) and indicators for MetaTrader 4
Hire a Developer: Use the MQL5 Freelance section to hire a programmer to write a new script based on the behavior of the EA you like. Hire a Developer: Use the MQL5 Freelance section
Legality and Ethics: Decompiling software can have legal implications. Ensure you're doing so for legitimate purposes and within the bounds of the software's license agreement.
Strict Encryption: Modern EX4 files are heavily protected. Most "free" decompilers found online only work for very old files (pre-2014).
: Modern EX4 files (Build 600+) use machine instructions rather than bytecode, making them almost impossible to reverse engineer cleanly. Obfuscated Output : Even if a tool "works," the resulting code often has random variable names