: Reverse-engineering is generally only legally permissible for personal educational analysis or ensuring compatibility with other software, provided you legally own the original file. Legitimate Alternatives to Decompilation

MetaQuotes (the creator of MT4) completely overhauled the compiler with Build 600 and later versions.

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The output of a decompiler often contains syntax errors or logical inconsistencies that prevent it from compiling back into an executable without significant manual correction.