An EX4 file is the compiled binary version of an MQL4 source file. When you write an Expert Advisor (EA) in the MetaEditor and click "Compile," the system generates:
Even if you find a "working" decompiler for older files, the resulting MQ4 code is rarely perfect. The decompilation process often loses variable names (replacing them with generic names like var1 , var2 ), comments, and structure. The code may compile, but it will likely execute logic incorrectly, leading to trading losses.
