If you understand MQL4 programming, you can replicate the functionality of an EX4 file without viewing its source code.

Converting an EX4 file to an MQ4 file—a process known as decompilation

With the rise of ChatGPT and other LLMs, some traders attempt to copy-paste the binary gibberish of an EX4 file into an AI to "translate" it.

Using EX4toMQ4 :

Tools like EX4 to MQ4 Decompiler 4.0 are occasionally found on developer forums or Google Groups. They typically require you to drag and drop the EX4 file into a window to generate a basic MQ4 file.

MetaQuotes (the developer of MT4) has strengthened EX4 encryption since build 600 (2014). Most free tools only work on extremely old EX4 files (pre-2014) and will fail or crash on modern ones.

If you want a legitimate alternative, here are safe options:

They often require you to download executable tools containing viruses or trojans.

This comprehensive article explains the differences between these file types, explores whether free conversion is possible, and guides you through the technical realities of decompiling MetaTrader files. Understanding EX4 vs. MQ4 Files

If you need the logic inside an EX4 file, the most reliable "free" method is actually an investment of your own time.

There are several reasons why you might want to convert EX4 to MQ4:

The short answer is The Reality of Modern MT4 Security