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This specialized software, an EX4 to MQ4 converter created to undo the compilation process for programs operating via the MT4 trading platform.

Operation and Data
The MetaTrader 4 platform uses the MetaQuotes Language 4 (MQL4) for creating custom Expert Advisors (EAs), indicators, and scripts.

The MQ4 file holds the core source code (human-readable code) written by the developer. This is the file you can view and modify in the MetaEditor.

The EX4 file is the ready-to-run, compiled file of the MQ4 code. Developers compile MQ4 files into EX4 files for distribution, as the compiled version executes more quickly on the trading terminal and protects the original source code from being easily accessed or edited.

The decompiler attempts to convert the compiled EX4 file back into a close approximation of the original MQ4 source code.

Purpose and Context
The primary reasons traders or programmers seek to decompile EX4 files include:

Code Recovery: Restoring missing MQ4 source code for an EA or indicator when only the compiled EX4 file remains after a hard drive failure, for instance.

Modification/Debugging: Accessing the source code to debug, modify, or customize the logic of an indicator or EA.

Analysis: Studying the trading strategy or algorithms used by a compiled program.

Limitations and Ethics
Key factors to note include:

Newer MT4 Builds: Modern versions of MT4 (Build 600 and later, released since 2014) use a different and more secure compiling technique, making decompilation much harder, if not impossible, for most commercial decompilers.

Incomplete Code: Decompilers often produce code that is obfuscated, incomplete, or hard to read, requiring significant developer work to restore functionality.

Legal/Ethical Issues: Decompiling commercial EAs or indicators with the intent to copy or steal the underlying strategy is generally a violation of the developer's intellectual property rights and is often considered a breach of law or ethics.