How to Allow DLL Usage in MT4: Steps, Risks, and Error Fixes

1. Introduction

MT4 (MetaTrader 4) is a powerful trading platform for many traders. Among its features, the setting to “Allow DLL imports” plays an important role in customization and extending functionality. By configuring this setting correctly, you can fully utilize the capabilities of Expert Advisors (EAs) and custom indicators.

However, incorrect DLL settings can lead to security risks and errors, so a proper understanding and careful operation are required. This article explains in detail why you should use DLLs in MT4, the setup steps, and important precautions.

2. What is an MT4 DLL?

Basic explanation of DLL (Dynamic Link Library)

DLL (Dynamic Link Library) is a file format that allows software to call functions from outside when performing specific tasks. In MT4, Expert Advisors and custom indicators use DLLs when executing complex calculations or special tasks.

Benefits of using DLLs in MT4

• Functionality expansion: Enables specific algorithms or data processing that are not available in standard MT4.
• Improved customization: Allows embedding unique features tailored to trading strategies.
• Integration with external software: Can be used to integrate MT4 with other programs or data sources.

3. Steps to Allow MT4 DLL Usage

Step 1: Open the Options Screen

Launch MT4 and select Tools → Options from the menu at the top of the screen. This action will display the settings window.

Step 2: Select the ‘Expert Advisors’ Tab

Click the Expert Advisors tab within the Options window. This section is where you configure settings related to EAs and indicators.

Step 3: Allow DLL Usage

Check the Allow DLL imports (trusted applications only) option. Enabling this checkbox allows MT4 to use DLL files.

Step 4: Save Settings

Click OK to save the settings. Then restart MT4 for the changes to take effect.

4. Risks and Precautions When Using DLL Settings

Risks of DLL

Using DLLs carries the following risks.

• Security risk: Unauthorized DLL files that infiltrate the system can lead to personal data leaks or malware infections.
• Program instability: Using untrusted DLLs can cause MT4 to become unstable.

Precautions

• Obtain from trusted sources: It is important to download DLLs from reliable developers or official sites.
• Use antivirus: Install security software and develop the habit of scanning DLLs before use.
• Disable unnecessary DLLs: Reducing risk by reverting settings to disallow unused DLLs.

5. Common Issues and Their Solutions

Reasons Why DLLs Don’t Work and How to Fix Them

• “DLL is not allowed” error:
• Cause: DLL usage is not permitted, or the DLL file is corrupted.
• Solution: Double-check your settings and use the correct file.
• EA or indicator not working:
• Cause: The DLL may not be loaded correctly, or you might be using an outdated MT4 version.
• Solution: Update MT4 to the latest version and reinstall the DLL file.

System Crashes

• Cause: An invalid DLL is consuming excessive system resources.
• Solution: Identify the problematic DLL and either delete it or stop using it.

6. FAQ (Frequently Asked Questions)

Q1: What happens if you do not allow the use of DLLs?

A1: Some EAs and indicators may stop working correctly.

Q2: Do I need to set DLLs manually every time?

A2: Usually, once you set it, you don’t need to change it thereafter.

Q3: What should I do if the DLL error is not resolved?

A3: Check your security software and Windows settings, and if that doesn’t resolve the issue, we recommend consulting an expert.

7. Summary

The setting to use DLLs in MT4 is very important for utilizing EAs and indicators. However, it is necessary to recognize security risks and use only trusted files. Referencing the procedures and precautions explained here, let’s customize MT4 safely and efficiently.

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