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Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version !!better!! -

The search for "Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version" typically refers to software designed to reverse-engineer MetaTrader 4 (MT4) executable files back into their original source code. Understanding the EX4 to MQ4 Relationship

MQ4 Files: These are human-readable text files containing the source code for Expert Advisors (EAs), indicators, or scripts written in the MQL4 language.

EX4 Files: These are compiled binary versions of MQ4 files that the MT4 terminal can execute. They are designed to protect the developer's intellectual property by making the code unreadable to users.

Decompilation: This process attempts to translate the machine-readable EX4 back into MQ4 source code. While tools like "Version 4.0.5" were once effective for older versions of MT4, they struggle with modern "Build 600+" files which use stronger encryption and optimization. Major Risks and Considerations

Technical Limitations: Modern decompilers often produce "broken" or obfuscated code where variables and comments are missing, making the resulting MQ4 file nearly impossible to modify or understand.

Security Hazards: Downloads marketed as "Full Version" or "Cracked" decompilers are high-risk. They are frequently bundled with malware, Trojans, or ransomware that can compromise your trading account credentials.

Legal and Ethical Issues: Decompiling third-party software often violates the software's End-User License Agreement (EULA) and intellectual property laws. Using such tools to bypass paid licenses is considered software piracy.

Malware Analysis: Security services like Hybrid Analysis often flag these specific executables as suspicious.

For legitimate modifications, it is recommended to contact the original developer for the MQ4 file or seek help from verified coding communities like MQL5 or Forex Factory.

Are you trying to recover your own lost code or modify a tool you purchased from someone else? Software decompile ex4 to mq4

I’m unable to provide a guide, download links, or support for “Ex4 To Mq4 Decompiler Version 4.0.5” (or any version) because:

  1. It violates MetaQuotes’ terms of service – Decompiling an EX4 file (compiled MetaTrader 4 program) back to MQ4 source code is explicitly forbidden by the MetaTrader 4 license agreement.
  2. It is typically used for piracy – Most people seek decompilers to recover source code of commercial Expert Advisors or indicators without paying for them or without the author’s permission.
  3. Legal risks – Distributing or using such tools can lead to copyright infringement claims, account bans by brokers, and civil liability.
  4. Security risks – So-called “full version” cracks or keygens often contain malware, keyloggers, or backdoors.

If you lost your own MQ4 source code:

If you want to learn from existing EX4 files:

If you need to recover a corrupted MQ4 file:

No legitimate guide for this decompiler exists because its primary purpose is unauthorized decompilation. I’d recommend focusing on legitimate development and backup practices instead.

I’m unable to provide a draft that promotes, endorses, or facilitates the use of software designed to decompile proprietary trading code (like converting EX4 to MQ4), especially when labeled with terms like “full version” or “crack.” These tools typically violate the terms of service of trading platforms (such as MetaTrader 4/5) and infringe on intellectual property rights of code developers.

If you still need a general informational post about the risks of such tools, I’d be glad to help. Here’s an example of how that might look:

Title: Understanding the Risks of EX4 to MQ4 Decompilers

There is ongoing discussion in trading communities about tools claiming to convert compiled EX4 files back to source MQ4 code. Programs like “Ex4 To Mq4 V4 Decompiler Version 4.0” are sometimes shared on third-party forums or file-sharing sites, often labeled as “full versions” or “cracks.”

Before considering such tools, traders should be aware of several important issues:

In short, while the idea of accessing and modifying any indicator or EA may be tempting, the practical, legal, and security risks of using unofficial decompilers far outweigh any potential benefit.

Ex4 to MQ4 Decompiler Version 4.0.5: The Complete Guide to Reversing MetaTrader 4 Executables

Chapter 6: Where to Find "Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version"

I do not condone piracy, but as an informational article, here is where such files are typically found (use at your own risk):

| Platform | Risk Level | Notes | |----------|------------|-------| | Forex forums (ForexFactory, MQL5 Community) | Medium | Links are often deleted; threads hidden. | | Telegram channels (search: MT4 decompiler) | High | Many fake versions containing malware. | | GitHub | Medium | Usually removed quickly due to DMCA. | | BitTorrent / Pirate Bay | Very High | High chance of trojans, keyloggers, crypto miners. | | Private Russian/Chinese forums | Extreme | Often require payment; some are legitimate but legally grey. |

WARNING: Always scan downloaded decompilers with VirusTotal and run them in a sandboxed environment. Many "cracked full versions" are actually RATs (Remote Access Trojans) designed to steal your trading account credentials or crypto wallets.

Chapter 5: Is It Legal? The Ethical and Practical Dilemma

This is the most critical section. The legality of decompilation depends on:

Chapter 4: How It Works (Technical Deep Dive)

The decompiler does not "decrypt" the EX4. Instead, it performs reverse engineering through these steps:

  1. Bytecode parsing – The .ex4 file contains a header, a string table, a constant pool, and P-code (portable code similar to Java bytecode).
  2. Control flow graph reconstruction – The decompiler maps jumps, loops, conditionals, and function calls.
  3. Type inference – Guesses variable types (int, double, string, bool, datetime, color) based on operations.
  4. MQL4 syntax generation – Outputs valid .mq4 code that can be recompiled in MetaEditor.

However, perfection is impossible. Decompiled code often contains:

Thus, even with Version 4.0.5, manual code cleanup is always required.

Legal and Ethical Considerations

Conclusion

The EX4 to MQ4 V4 Decompiler Version 4.0.5 Full Version serves a niche but important role in the MetaTrader ecosystem. Whether you're a developer looking to recover lost work, a trader interested in learning from others' strategies, or a researcher analyzing trading algorithms, such tools can be invaluable. However, it's crucial to use them responsibly and within the bounds of applicable laws and ethical standards.

If you're interested in such tools, I recommend looking into the official documentation or reputable sources that discuss the legal and technical aspects of using decompilers.

While searching for Ex4 To Mq4 V4 Decompiler Version 4.0.5 , you’ve likely encountered many "Full Version" downloads or "Cracked" installers. Before you hit download, it is vital to understand that this software is largely a relic of the past and a modern security risk. The Harsh Reality of EX4 to MQ4 Decompilers

Most traders look for these tools to recover lost source code or study an Expert Advisor (EA). However, the technology behind them has reached a dead end for current MetaTrader 4 (MT4) builds. Version 4.0.5 is Outdated

: This specific version was designed by the Purebeam team around 2009. It was highly effective for EX4 files compiled with MT4 build 509 or lower (pre-2014). The Build 600 Barrier Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version

: In 2014, MetaQuotes updated the MQL4 compiler (Build 600+) to use machine instructions instead of byte code. Modern EX4 files are essentially "compiled" similarly to C++ programs, making clean decompilation back to human-readable MQ4 nearly impossible. Broken Code

: Even if a decompiler runs on a modern file, the output is typically "garbage" code—missing variable names, comments, and logical structures, making it useless for editing or learning. Serious Security and Legal Risks

The "Full Version" and "Free Download" links for these decompilers are frequently used as bait by malicious actors. Malware & Viruses

: Many "cracked" versions of this decompiler found on forums are flagged as malicious by security analysts at Hybrid Analysis

. They can install backdoors that steal your trading account credentials or personal data. Decompiler Scams

: Some websites charge hundreds of dollars for "decompilation services," but according to reports on Forex Peace Army

, these are often scams where the seller disappears after payment or provides broken files. Legal Infringement

: Decompiling proprietary EAs without the author’s permission is a violation of intellectual property rights and MetaQuotes' terms of service. Better Alternatives

If you are stuck without source code, there are safer ways to proceed than using a 15-year-old decompiler: Ex4 to Mq4 Decompiler is a scam - Forex Peace Army 20 Feb 2021 —

Ex4 To Mq4 V4 Decompiler Version 4.0.5 is a legacy software tool originally designed to reverse engineer MetaTrader 4 (MT4) compiled files (.ex4) back into editable source code (.mq4) Essential Reality Check

While many websites still advertise "Version 4.0.5 Full Version," users should be aware of several critical limitations and risks: Build Compatibility: It only works for EX4 files compiled with MetaTrader 4 Build 509 or lower (pre-2014). Modern Failure: It cannot decompile files from Build 600 or higher

, which use modern encryption and a completely different binary structure. Malware Risk:

Many "free" or "cracked" versions of this tool found on forums are flagged as suspicious or malicious by antivirus scanners. Code Integrity:

Even when it works, the resulting code often lacks comments, original variable names, and proper formatting, making it difficult to read. Google Groups 🛠️ Technical Overview The tool was developed by the

team around 2009 to assist developers in recovering lost source code or studying Expert Advisor (EA) logic. Key Features (Legacy) Drag-and-Drop:

Users could simply drop an .ex4 file into the window for conversion. Batch Processing:

Some versions supported decompiling multiple files simultaneously. Indicator/EA Support:

Designed to handle both MetaTrader indicators and automated trading robots. Why It Stopped Working In early 2014, MetaQuotes released

, which fundamentally changed how MQL4 is compiled. Modern .ex4 files are now closer to machine code, making 1:1 decompilation back to human-readable .mq4 virtually impossible with legacy tools. ⚖️ Legal and Ethical Considerations

Decompiling software often exists in a legal gray area or is explicitly prohibited: Copyright Infringement:

Decompiling an EA you do not own to bypass licensing is generally and unethical. Permitted Use: Legitimate use cases are typically limited to recovering your own lost code or educational analysis for personal use. Terms of Service: Using decompiled code may violate the MetaTrader License Agreement 💡 Better Alternatives

If you need to modify an indicator or EA today, consider these safer paths: Can You Convert EX4 to MQ4? The Honest Truth (MT4 Guide)

The search for an "Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version" is common among Forex traders who have lost the source code to their Expert Advisors (EAs) or want to study the logic of a compiled file.

However, finding a working version of this software in the current trading landscape is difficult. Here is everything you need to know about the state of decompilation for MetaTrader 4. What is an EX4 to MQ4 Decompiler?

In the MetaTrader 4 (MT4) ecosystem, there are two main file types:

MQ4: The source code written in MQL4. This is readable and editable by humans.

EX4: The compiled version of the code. This is what the MT4 platform executes, but the code is "locked" and unreadable.

A decompiler is a tool designed to reverse this process, turning the compiled binary back into readable code. The Reality of Version 4.0.5

Most "Version 4.0.5" or "V4" decompilers you find online today are outdated.

The MetaQuotes Update: Years ago, MetaQuotes (the developers of MT4) released a massive update (Build 600+) that changed the way EX4 files are compiled. This update implemented high-level encryption and a completely different file structure.

Compatibility Issues: The old decompilers, including the famous V4.0.425 and 4.0.5 versions, only work on EX4 files compiled with very old versions of MT4 (pre-2014). They generally fail on any modern EA downloaded or compiled today. Risks of Downloading "Full Version" Decompilers

When searching for "Full Version" or "Cracked" decompiler software, users face significant risks: The search for "Ex4 To Mq4 V4 Decompiler Version 4

Malware and Trojans: Because this software sits in a legal "gray area," many downloads are injected with viruses or keyloggers designed to steal your trading account credentials.

Fake Software: Many sites claim to have a "Version 4.0.5" that works on modern builds, but after downloading, the software either doesn't run or produces "garbage" code that cannot be compiled.

Scams: Some sites require payment for a "license key" for a tool that no longer functions on updated MT4 files. Are There Alternatives?

If you truly need to recover a project or understand a strategy, there are safer paths than hunting for old decompilers:

Manual Programming: If you understand the strategy the EA uses, it is often faster and more reliable to hire a developer to rewrite the logic from scratch in MQ4.

Decompilation Services: There are professional services that perform "manual decompilation." Instead of using a one-click tool, experts use debuggers to reconstruct the code logic. These are expensive but are the only way to handle modern EX4 encryption.

Code Repositories: Before trying to decompile, check the MQL5 Market or GitHub. Many popular EAs have open-source versions or similar logic available for free. Final Word on Ethics and Legality

It is important to remember that decompiling someone else’s intellectual property without permission may violate copyright laws and the Terms of Service of the MQL5 community. Always ensure you have the legal right to the code before attempting to reverse engineer it.

Do you have a specific EX4 file you're trying to recover, or

Unlocking the Power of Forex Trading: A Comprehensive Guide to Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version

In the world of Forex trading, the ability to analyze and understand the code behind trading strategies is crucial for success. One of the most popular tools used by traders to decompile and analyze Expert Advisors (EAs) and indicators is the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version. In this article, we will explore the features, benefits, and uses of this powerful tool, as well as provide a comprehensive guide on how to use it.

What is Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version?

Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version is a software tool designed to decompile and convert EX4 files, which are compiled files used by MetaTrader 4 (MT4) to run EAs and indicators, into MQ4 files, which are the source code files used to create EAs and indicators. This tool allows traders to analyze, modify, and optimize their trading strategies by providing access to the underlying code.

Key Features of Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version

The Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version comes with a range of features that make it an essential tool for Forex traders. Some of the key features include:

  1. Decompilation of EX4 files: The tool can decompile EX4 files, allowing traders to access the underlying MQ4 code.
  2. Conversion to MQ4 files: The decompiled code can be converted into MQ4 files, which can be edited and modified using the MetaTrader 4 editor.
  3. Support for all MT4 versions: The tool supports all versions of MetaTrader 4, including the latest versions.
  4. Advanced decompilation algorithms: The tool uses advanced decompilation algorithms to ensure that the decompiled code is accurate and reliable.
  5. User-friendly interface: The tool has a user-friendly interface that makes it easy to use, even for traders with limited technical knowledge.

Benefits of Using Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version

The Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version offers a range of benefits to Forex traders, including:

  1. Improved trading performance: By analyzing and optimizing the code behind their trading strategies, traders can improve their trading performance and increase their profits.
  2. Increased flexibility: The tool allows traders to modify and customize their EAs and indicators, giving them more flexibility in their trading strategies.
  3. Better risk management: By analyzing the code behind their trading strategies, traders can identify potential risks and take steps to mitigate them.
  4. Enhanced security: The tool allows traders to verify the authenticity of EAs and indicators, reducing the risk of using malicious or faulty code.

How to Use Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version

Using the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version is relatively straightforward. Here is a step-by-step guide:

  1. Download and install the tool: Download the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version from a reputable source and install it on your computer.
  2. Launch the tool: Launch the tool and select the EX4 file you want to decompile.
  3. Decompile the EX4 file: Click on the "Decompile" button to decompile the EX4 file.
  4. Analyze and modify the code: Once the decompilation is complete, you can analyze and modify the code using the MetaTrader 4 editor.
  5. Compile and test the code: Compile and test the modified code to ensure that it works as expected.

Conclusion

The Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version is a powerful tool that offers Forex traders a range of benefits, including improved trading performance, increased flexibility, and better risk management. By providing access to the underlying code behind EAs and indicators, this tool allows traders to analyze, modify, and optimize their trading strategies. With its user-friendly interface and advanced decompilation algorithms, the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version is an essential tool for any serious Forex trader.

Frequently Asked Questions

  1. What is the difference between EX4 and MQ4 files? EX4 files are compiled files used by MetaTrader 4 to run EAs and indicators, while MQ4 files are the source code files used to create EAs and indicators.
  2. Is the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version safe to use? Yes, the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version is safe to use, as long as it is downloaded from a reputable source.
  3. Can I use the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version to decompile all EX4 files? Not all EX4 files can be decompiled, as some may be encrypted or protected. However, the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version uses advanced algorithms to decompile most EX4 files.

Additional Resources

For more information on the Ex4 To Mq4 V4 Decompiler Version 4.0 5 Full Version, you can visit the following resources:

While software claiming to be "Ex4 To Mq4 V4 Decompiler Version 4.0.5" is often searched for, modern versions of MetaTrader 4 (build 600 and higher) use advanced compilation that makes full, human-readable decompilation practically impossible

Tools from the "v4" era were primarily designed for MetaTrader build 509 or lower (pre-2014) and generally fail on modern

files. Furthermore, many files marketed as "full version" or "cracked" versions of these decompilers are flagged as or containing malware by security analysts. Google Groups Risks and Limitations Malware Threat

: Many downloads for this specific tool are known to contain viruses or backdoors that can compromise your trading account or computer. Broken Code

: Even if the tool runs, it often produces "obfuscated" or broken code where logic is missing and variables are renamed to generic placeholders (e.g., ), making it unusable for editing. Incompatibility : These tools cannot process modern

files which are compiled into binary machine code rather than the older byte-code format. Hybrid Analysis General Process (For Legacy Files Only)

If you are attempting to recover your own lost source code from a legacy (pre-2014) file, the typical process used by these older utilities involves: Environment Setup : Installing old dependencies like Microsoft .NET Framework 2.0 File Loading : Dragging the file into the decompiler interface. Extraction : The tool attempts to generate a file in an output folder. De-obfuscation

: A manual, time-consuming process to rename variables and fix logic errors in MetaEditor Legal and Ethical Considerations ex4 to mq4 4.0.509.5 freeware.exe - Hybrid Analysis It violates MetaQuotes’ terms of service – Decompiling

  1. a report on a specific "Ex4 To Mq4 Decompiler Version 4.0" (features, usage, legality, risks), or
  2. help decompiling a particular EX4 file to MQ4 (provide the file or its contents), or
  3. help finding/download sources for a full version?

Pick 1, 2, or 3. If 2 or 3, confirm you have legal right to decompile the file.

Unlocking the Power of MetaTrader: A Comprehensive Guide to Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version

In the world of forex trading, MetaTrader has established itself as a leading platform for traders and developers alike. The platform's versatility and customizability have made it a favorite among traders, who rely on expert advisors (EAs), indicators, and scripts to make informed trading decisions. However, one major limitation of the platform is the inability to modify or understand the source code of compiled EX4 files. This is where the Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version comes in – a powerful tool that allows users to decompile EX4 files and gain access to their source code.

What is Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version?

The Ex4 to Mq4 V4 Decompiler is a software application designed to reverse-engineer EX4 files, which are compiled versions of MetaTrader 4 (MT4) programs written in MQL4. The decompiler converts these EX4 files back into their original MQL4 source code, allowing users to view, modify, and analyze the code. The Version 4.0.5 Full Version is the latest iteration of this software, offering improved performance, accuracy, and compatibility with various MT4 builds.

Key Features of Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version

  1. Accurate Decompilation: The software boasts an impressive decompilation accuracy, often producing readable and compilable code that closely resembles the original source code.
  2. Support for Various MT4 Builds: The decompiler is compatible with multiple MT4 builds, ensuring that users can work with EX4 files created on different platforms.
  3. MQL4 Syntax Highlighting: The software features syntax highlighting, making it easier to read and understand the decompiled code.
  4. Code Formatting: The decompiler can automatically format the decompiled code, making it more readable and maintainable.

Benefits of Using Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version

  1. Recovery of Lost Source Code: If you've lost your original source code, the decompiler can help you recover it, saving you time and effort.
  2. Analysis and Debugging: By analyzing the decompiled code, you can identify issues, optimize performance, and improve the overall functionality of your EAs and indicators.
  3. Modification and Customization: With access to the source code, you can modify and customize your EAs and indicators to suit your specific trading needs.
  4. Education and Research: The decompiler can serve as a valuable learning tool, allowing developers to study and understand the inner workings of complex EAs and indicators.

Conclusion

The Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version is a powerful tool that unlocks the secrets of compiled EX4 files, providing users with access to their source code. Whether you're a trader, developer, or researcher, this software can help you optimize, customize, and understand the behavior of your EAs and indicators. With its high accuracy, compatibility, and feature-rich interface, the Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version is an essential tool for anyone working with MetaTrader 4.

Where to Get Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version?

The software can be downloaded from various online sources, but be cautious when selecting a vendor to avoid scams or malware. Always opt for reputable sources and follow best practices when installing and using the decompiler.

Disclaimer

The use of the Ex4 to Mq4 V4 Decompiler Version 4.0.5 Full Version is subject to MetaTrader's terms and conditions. Users should ensure they comply with all applicable laws and regulations when decompiling and modifying EX4 files.

Ex4 To Mq4 V4 Decompiler Version 4.0.5 Full Version Review

The Ex4 To Mq4 V4 Decompiler is a software tool designed to decompile and reverse-engineer compiled MetaTrader 4 (MT4) expert advisors, indicators, and scripts, commonly known as .ex4 files. The goal of this review is to assess the capabilities and performance of Version 4.0.5 Full Version of this decompiler.

Key Features:

  1. Decompilation: The primary function of this software is to decompile .ex4 files back into their source .mq4 code. This is particularly useful for traders and developers who have lost their original source code or need to understand how a particular expert advisor or indicator works.

  2. Compatibility: It claims to support a wide range of .ex4 files, including those compiled with various versions of the MetaTrader 4 compiler.

  3. Recovery of Original Code: The decompiler aims to recover as much of the original code as possible, including comments and formatting, although success can vary depending on the complexity of the compiled file and how it was originally compiled.

Pros:

Cons:

Performance:

The performance of Ex4 To Mq4 V4 Decompiler Version 4.0.5 Full Version appears to be satisfactory based on user reviews. It successfully decompiles a wide range of .ex4 files, often recovering a significant portion of the original .mq4 code. However, results can vary, and not all decompilation attempts are successful.

Conclusion:

The Ex4 To Mq4 V4 Decompiler Version 4.0.5 Full Version is a useful tool for traders and developers looking to recover lost source code or understand the workings of MT4 compiled files. While it offers a user-friendly experience and a relatively high success rate, potential users should be aware of the limitations and legal considerations associated with decompilation.

Recommendation:

Rating: Based on the information available and reported user experiences, a rating of 4 out of 5 stars seems appropriate, reflecting its utility and performance while also considering the potential limitations and concerns.

Ex4 To Mq4 V4 Decompiler Version 4.0.5 is a legacy reverse-engineering tool designed to convert compiled MetaTrader 4 (MT4) executable files (.ex4) back into editable source code (.mq4). Technical Effectiveness

Target Compatibility: This specific version (and related builds like 4.0.432) was primarily effective for MT4 files compiled with Build 509 or lower (pre-2014).

Modern Limitations: It is inoperable on any .ex4 file compiled with MT4 Build 600 or higher. MetaQuotes fundamentally changed the compilation method from "byte code" to "binary code" (similar to C++), making these older decompilers obsolete.

Output Quality: Even when successful on old files, the output is often "broken" or "obfuscated". Original variable names and comments are lost, replaced by generic placeholders like gi_212 or g_var_1. Critical Safety Warnings ex4 to mq4 4.0.509.5 freeware.exe - Hybrid Analysis

Understanding EX4 to MQ4 V4 Decompiler Version 4.0.5 Full Version

The EX4 to MQ4 V4 Decompiler is a tool designed for a specific audience within the trading and programming communities. EX4 and MQ4 are file extensions associated with MetaTrader, a popular platform for trading Forex and other financial instruments. The MQ4 file format is used for source code files written in MQL4, a programming language used to create trading strategies, technical indicators, and automated trading systems (Expert Advisors) for the MetaTrader 4 platform.

The EX4 format, on the other hand, represents compiled MQ4 files. When an MQ4 file is compiled, it becomes an EX4 file, which can be executed on the MetaTrader platform but can no longer be edited because the source code is lost.