: The compilation process discards comments, local variable names, and sometimes function signatures. The decompiler cannot recover these, resulting in generic names like var1 , var2 , and func1 .
Years ago, MetaQuotes (the creator of MetaTrader) completely overhauled the MQL4 compiler with the release of MT4 Build 600 and subsequent versions. They upgraded the MQL4 language to match the security, structure, and strict compilation standards of MQL5 (which is highly similar to C++). Ex4 To Mq4 Decompiler-5.0 1 Exe