How to Open an Ex4 File in MT4

Opening an ex4 file in MT4 is a necessary step for installing custom indicators, expert advisors, and scripts. These files contain program code written in the MQL4 programming language and are compiled into executable files that can be read by the MT4 platform. However, many traders may encounter difficulties when trying to open these files in MT4, especially if they are new to trading or programming. In this article, we will guide you through the process of opening an ex4 file in MT4, so you can install your desired trading tools and enhance your trading experience.

What is an Ex4 File?

An ex4 file is a compiled file created by MetaEditor when programming in MQL4, the programming language used to develop custom indicators and Expert Advisors (EAs) for MetaTrader 4 (MT4). The ex4 file contains the executable code for an indicator or EA, which can be used on the MT4 trading platform. The file extension “ex4” stands for “executable file for MT4,” and it is not editable or readable in its compiled form. Therefore, to modify or edit the source code of an indicator or EA, you need the original .mq4 file, which can be opened in MetaEditor.

How to Open an Ex4 File in MT4

To open an ex4 file in MT4, you need to follow these steps:

  • Open the MT4 platform and go to “File” in the top left corner.
  • Click on “Open Data Folder” from the drop-down menu.
  • Open the “MQL4” folder.
  • Open the “Experts” or “Indicator” folder.
  • Copy the ex4 file you want to use into the “Experts” folder.
  • Close and reopen the MT4 platform.
  • Go to the “Navigator” window on the left side of the screen.
  • Click on the “Expert Advisors” tab.
  • Find the ex4 file you copied and double-click on it.
  • A pop-up window will appear. Click “OK” to attach the ex4 file to the chart.

Once the ex4 file is attached to the chart, it will execute the code and start running the program. You can customize the settings and parameters of the ex4 file from the “Inputs” tab in the pop-up window.

It’s important to note that ex4 files are compiled files, which means you cannot edit the code. If you need to modify the code of an ex4 file, you need to have the original source code file (mq4) and compile it to create a new ex4 file.

Why Open an Ex4 File in MT4?

Traders may want to use custom indicators and EAs for a variety of reasons. For example, custom indicators can help traders identify potential trading opportunities that may not be immediately apparent through traditional analysis methods. EAs can also help traders execute trades automatically based on specific criteria, which can be particularly useful for traders who are not able to monitor the markets constantly.

However, it is important to understand how to open ex4 files in MT4 in order to use custom indicators and EAs effectively. This requires some knowledge of the MT4 platform and how it works. It is also important to compare the use of custom indicators and EAs with other trading strategies to determine which approach is most appropriate for your trading style.


By following the steps outlined in this article, you can open ex4 files in MT4 and take advantage of the powerful tools provided by custom indicators and forex EAs. However, it is important to remember that these tools come with risks, and traders should thoroughly test and optimize their custom indicators and EAs before using them in live trading. With the right approach and careful attention to risk management, custom indicators and EAs can be valuable assets in a trader’s arsenal.

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