Decompiling software you didn’t write is often a violation of the developer's End User License Agreement (EULA) and intellectual property laws. I can't find proper "old" "ex4 to mq4 decompiler"?
Even if the tool functions without malware on a genuine legacy file, the code it produces uses deprecated MQL4 functions. Modern MT4 platforms will refuse to compile or run code structured for pre-Build 600 environments without extensive manual rewriting. Legitimate Alternatives to Decompilation
. Numerous books, online courses, and documentation are available for learning MQL4 from scratch. Building expertise in the language ultimately provides more value than reverse‑engineering existing programs.
If an attacker gains access to your active MetaTrader terminal, they can manipulate trades, drain account balances, or copy your funds out via illicit trading activity. 3. Ransomware
Before 2014, MT4 used an older compiler architecture. Executable .ex4 files contained highly predictable structures. This allowed commercial decompilers—most notably a widely circulated tool called "EX4 to MQ4 Decompiler v4.0"—to reconstruct nearly flawless .mq4 source code from a compiled file. The decompiled code retained variables, structural logic, and formulas, making it easy to copy or modify protected intellectual property. MetaQuotes Build 600: The Turning Point
Specialist assembly-level programmers who reverse-engineer binaries by analyzing hex code and memory dumps. These services are highly expensive, require custom work, and cannot be automated by a simple downloaded executable.
Are you looking to recover a or expert advisor ? Do you need help fixing errors in the decompiled code?