An is the compiled, machine-readable version of an MQ4 file. It contains bytecode that the MetaTrader 4 terminal can execute.
MetaQuotes (the makers of MT4) updated the platform (Build 600+) to make decompiling nearly impossible. Even if a tool works, it often produces "spaghetti code" that is broken and missing the original comments and variable names. Developers often share only the
: In the "Navigator" pane (on the left), find your .mq4 file. Double-click it to see the code. Compile : Click the Compile button at the top or press F5 . Check Output : Look at the "Errors" tab at the bottom.
