A: No. If you lose your MQL4 source, you cannot recover it from EX4. Always keep backups in multiple locations (cloud, external drive, version control like GitHub).
Reverse-engineering a file strictly to understand its logic for personal education is a legal gray area in some jurisdictions. However, decompiling a paid commercial EA to distribute it for free or resell it is illegal and subject to severe penalties. Conclusion
When an MQL4 file is compiled into EX4:
Before attempting conversion, it is essential to understand what you are working with:
Convert your observations into clear pseudo-code (e.g., IF Fast MA crosses Slow MA upward AND RSI is above 50, THEN BUY ). how to convert ex4 file to mql4
: Decompilers only worked on "Old Builds" (build 509 and lower) from before 2014.
Even with the best available tools, it's important to have realistic expectations about the decompilation outcome: Reverse-engineering a file strictly to understand its logic
If you have an EX4 file that you absolutely need in MQL4 format, follow this workflow:
If the EA is commercial, contact the developer. Some sellers offer an "open code" version for an additional fee. This guarantees a clean, working, and legal copy of the MQ4 file. : Decompilers only worked on "Old Builds" (build
There are several reasons why you might want to convert an EX4 file to MQL4:
This is the human-readable source code file. It contains the actual programming logic, variables, and strategies written by a developer. You can open and edit this file using the MetaEditor tool built into MT4.