Modern .ex4 files are heavily encrypted and obfuscated. There is no "Save As MQL4" button. To turn a modern EX4 back into MQL4, you generally have two paths: Option A: Use a Decompiler Service

: These tools rarely work on files compiled after 2014.

Given these realities, what should you do if you need the MQL4 source code for an EX4 file?