: If you lost your source code due to a hard drive crash, your best option is to contact the developer directly. Providing proof of purchase or historical code fragments is a reliable way to request an official copy.

Reverse-engineering software often breaches the End User License Agreement (EULA) stipulated by both the developer and the MetaQuotes platform. Safe Alternatives to Decompilation

The technical approach involves parsing the binary structure of the EX4 file and mapping its bytecode back to MQL4 syntax. This is a complex process that requires sophisticated tools to handle the various compiler versions and protections used by MetaQuotes over the years.