If you’re trying to recover your own lost MQL4 source code, the official path is to contact MetaQuotes or the original vendor — decompilation is not supported and is ethically problematic.
It sounds like you’re asking about — likely referring to decompiling MetaTrader 4 compiled executables ( .ex4 files), which are trading robots (EAs) or indicators written in MQL4. ex4 decompiler
Would you like help recovering a lost source code through legitimate means instead? If you’re trying to recover your own lost