The EX4 to MQ4 Decompiler 4.0.401.1 is a software application designed to decompile EX4 files, which are compiled EAs, indicators, and scripts used on the MT4 platform. The decompiler converts EX4 files back into their original MQ4 source code, allowing users to view, modify, and recompile them. This tool is particularly useful for traders who have lost their original MQ4 files or want to modify existing EAs and indicators.
If you purchased an Expert Advisor or an indicator and require custom adjustments (like adding a trailing stop or updating an expiration date), the safest methodology is to request the source code directly from the developer. Many developers will provide modifications or sell the .mq4 file for a reasonable service fee. 2. Utilize the iCustom() Framework
Only legal uses:
For example, consider the following original MQL4 code: ex4-to-mq4-decompiler-4.0.401.1 225
Users employ the decompiler for several legitimate purposes:
, trojans, or backdoors designed to steal trading account credentials. Modern Compatibility
Some fraudulent websites claim to offer a "premium decompilation service" for a fee (ranging from $50 to hundreds of dollars). They will take your money and your .ex4 file, and either send you corrupted junk or vanish entirely. Legal and Ethical Considerations The EX4 to MQ4 Decompiler 4
For modern traders, it is generally recommended to use open-source projects on platforms like
Disclaimer: This article is provided for informational and educational purposes only. The decompilation of software without proper authorization may violate intellectual property laws, licensing agreements, and platform terms of service. Readers are solely responsible for ensuring their use of any decompilation tools complies with applicable laws and licenses. Nothing in this article should be construed as legal advice or as an endorsement of illegal decompilation activities.
: MetaTrader developers and various legal jurisdictions consider the unauthorized decompilation of protected software to be a violation of intellectual property rights. If you purchased an Expert Advisor or an
Several legitimate scenarios might lead someone to seek decompilation capabilities:
For newer EA versions, what some claim to be decompilation services may actually be scams. As experts on the MQL5 forums point out, "Only the old MQL4 could be decompiled due to it being partially byte-code. Modern MQL4+ and MQL5 use more native code and are encrypted. They can still be cracked by someone highly knowledgeable, but they can no longer be decompiled (only disassembled, which is something completely different)". If you receive so-called proof of decompilation of modern EAs, it may be "most probably a scam to sell their services or the cracked versions of products".
: The compiled, binary version of that code that the MT4 platform executes.