If you wrote it and lost the source, decompiling is your right.
Since February 2014, MetaTrader 4 has used a much stronger compilation method. For these newer files, most experts agree that full, accurate decompilation is practically impossible how to convert ex4 file to mql4
The most significant loss is identifiers. Original variable and function names provide semantic meaning. After compilation, all user-defined names are replaced with memory addresses or short, meaningless tokens. A decompiler can produce a working code, but it will be filled with names like local_1 , local_2 , func_3() , making it nearly impossible to understand or maintain. If you wrote it and lost the source,
List the external parameters available in the "Inputs" tab. List the external parameters available in the "Inputs" tab
: Decompiling software without the owner's permission is generally illegal and violates intellectual property rights. Most reputable trading communities will not help with these requests. Common Methods & Their Success Rates Success Rate Review/Outcome Legacy Decompilers
Although a "one-click" conversion no longer exists for modern files, some technical approaches are used by experts for recovery or analysis:
A: Very old EX4 files compiled with MT4 build 509 or earlier (before obfuscation was added) might be partially decompilable. However, these builds are obsolete, and such files are rare.