The keyword reveals three specific user intentions:

: These are the source code files for MetaTrader 4 programs, written in MQL4. Before being compiled into ex4 files, mq4 files are readable and editable.

: Most available decompilers only work for MetaTrader 4 builds prior to 600 . Modern EX4 files use advanced encryption and obfuscation that make full source code recovery nearly impossible.