Many developers will provide the .mq4 file for free to verified customers, or offer to make the necessary code adjustments for you without charging a fee.
To help you get the exact solution you need, could you share a bit more context? If you can tell me or a third-party tool, and what specific changes you want to make to the file, I can guide you toward the safest way to modify or recreate its logic. Share public link
: After decompilation, review the generated MQ4 file. Some parts might not decompile correctly, especially if the original code was obfuscated or used advanced programming techniques.
If you happen to have an EX4 file created on a very old version of MT4 (pre-2014), some legacy decompiler software found on coding forums might work. However, modern MT4 will not even run these old files, and most indicators/EAs today are compiled on newer builds. 2. Manual Recovery (Coding Knowledge Required)
Not always. Many modern EX4 files incorporate anti-decompilation features that make it very difficult or impossible to recover the original source code.
: Perhaps the most legitimate reason—if a developer loses their original MQL4 source code due to hardware failure or accidental deletion, decompiling the EX4 might be the only way to recover their work.
While its exact origins are murky, this tool has a long-standing reputation within the trading community. However, it's worth noting that it might not be able to handle the newest EX4 file versions or those protected with advanced anti-decompilation techniques.
The tool was compiled on March 11, 2014, as indicated by its PE compilation timestamp, and it is digitally unsigned—common characteristics of third-party decompilation tools.
If you want to explore alternatives to decompiling, please let me know: Do you to the file? What specific indicator or EA are you trying to modify? Do you have any programming experience in MQL4?
For advanced users, the for free EX4 decompilation is an open-source Python library called LibEx4 .