If you are trying to understand a strategy, the best approach is to learn MQL4 and rebuild the logic, or use iCustom to leverage existing tools. If you'd like, I can:
When you "compile" an MQ4 file, it turns into an EX4. This is the version the MT4 platform actually runs. It is encrypted and not human-readable.
They may steal the Expert Advisor you upload and resell it or trade with it themselves. How To Convert Ex4 To Mq4 Free
Traders frequently need to convert compiled MetaTrader 4 files (.EX4) back into editable source code (.MQ4) to modify strategies, fix bugs, or recover lost work. While the market is flooded with claims of free decompression software, true reverse engineering requires a deep understanding of executable files and the risks involved. Understanding EX4 vs. MQ4 Files
Open the decompiled MQ4, press (select all), then Ctrl + Shift + F (format). This fixes indentation and makes the messy code slightly more readable. If you are trying to understand a strategy,
While many "free" online converters are scam sites designed to steal your EAs, there are genuine, albeit older, decompiler tools available. 1. Using Dedicated Decompiler Software (Legacy Tools)
If you purchased an EA or indicator, and ask for the source code. Some sellers provide MQ4 upon request for a small fee (or free if you have proof of purchase). It is encrypted and not human-readable
I understand you're looking for a way to convert an file (compiled MetaTrader 4 executable) back to MQ4 (source code) for free.
Many developers are reasonable. Explain your situation: