To understand why a decompiler is sought after, it helps to look at how MetaTrader 4 processes code:
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version
Software utilities like the "V4 Decompiler" or "Version 4.0.5" were highly effective. They could reconstruct nearly flawless MQ4 source code from an EX4 binary with a single click. These cracked versions circulated widely on forex forums and file-sharing networks, promising a "full version" free of limitations. Why Version 4.0.5 Does Not Work Today To understand why a decompiler is sought after,
Years ago, MetaTrader 4 used an older, less secure compiler. During that era, functional decompilers could easily reconstruct accurate .mq4 source code from an .ex4 file. Can’t copy the link right now
Convert compiled EX4 files back into readable MQL4 source code (MQ4 format).