If you understand MQL4 programming, you can replicate the functionality of an EX4 file without viewing its source code.
: For educational purposes, it is better to study open-source projects on repositories like the MQL5 CodeBase rather than attempting to reverse-engineer compiled files. Further Exploration Read about the technical evolution of MQL4 compilation and why modern builds are so difficult to reverse. Learn how to use the iCustom function
Converting (compiled) to MQ4 (source code) is a process known as decompiling . While widely sought for recovering lost source code or modifying Expert Advisors (EAs), it is technically complex and carries significant security and legal risks. The Reality of Free Conversion How To Convert Ex4 To Mq4 Free
Experimental tools on platforms like GitHub attempt to generate pseudocode from EX4 files, though these are often intended for analysis rather than producing a ready-to-run MQ4 file. :
Decompiled code is rarely 100% accurate. Relying on a decompiled EA for live trading can lead to unexpected glitches and financial loss. The Best Alternative: Hire a Programmer If you understand MQL4 programming, you can replicate
If the developer refuses or has disappeared, you have two ethical choices:
If you upload your EX4 file to a shady online converter, the provider might return a modified MQ4 file. This file could contain hidden "backdoors" designed to intentionally lose trades, copy your account balance, or send your trade data to a third party. Learn how to use the iCustom function Converting
You can use the iCustom function in your own MQ4 code to call data from an EX4 file.
Write a new MQ4 file that replicates those mathematical outputs using standard MQL4 technical indicator functions (like iMA , iRSI , or iCustom ). 3. Search Open-Source Repositories
The MQ4 file is the "source code"—the editable version where you can see the logic of an indicator or Expert Advisor (EA). The EX4 file is the "compiled" version—the one the MT4 platform actually runs. Many traders find themselves with a great EX4 file but no way to modify it because they lack the source code.