The Complete Guide to Medal of Honor: Allied Assault in 2025

Relive the classic World War II shooter with modern compatibility and multiplayer support!

Thanks to the OpenMohaa project, you can now experience this classic with modern compatibility, enhanced performance, and active multiplayer servers.

This comprehensive guide will walk you through everything you need to:

✅ Install and run MOHAA on modern systems (Windows, Mac, Linux)
✅ Set up multiplayer gaming with friends
✅ Host your own dedicated server
✅ Add custom maps and modifications

What You'll Need

Original MOHAA game files (legally purchased from GOG)
30 minutes for setup
Basic terminal/command line familiarity (we'll guide you through it!)

For detailed technical documentation, check these folders:

📥 Part 1: Getting the Game Files

Step 1: Purchase & Download from GOG

Create an account on GoG and buy the original game Medal of Honor: Allied Assault War Chest
Go to your account => Games => Medal of Honor: Allied Assault War Chest => At the bottom of the page you can find a section named Download offline backup game installers
- You should be able to view them from this link once you login: https://www.gog.com/en/account
Download the game's 3 files (setup_medal_of_honor_2.0.0.21.exe, setup_medal_of_honor_2.0.0.21-1.bin, setup_medal_of_honor_2.0.0.21-2.bin)

Step 2: Install Original MOHAA

Windows users:

Run the .exe file to extract the game files

Mac & Linux users:

Install innoextract using brew install innoextract or other package managers for extracting the game files from the .exe file
Run innoextract setup_medal_of_honor_2.0.0.21.exe to extract the game files
This will create app & tmp directories. Feel free to delete the tmp directory after extraction
The app folder is the game directory. You can rename it to mohaa or any name you prefer

🚀 Part 2: Installing OpenMohaa

Step 3: Download OpenMohaa Release

Navigate to the releases page of OpenMohaa on GitHub. Find the latest release (as of Aug 2025, it's v0.82.1). Scroll to the Assets section at the bottom and pick the appropriate version for your system architecture.

Most probably you will need one of the following:

Download the zip file and extract the files directly into the game directory (the one you created in the previous step).

Step 4: Prepare Files for Execution

Windows users: Nothing is needed in this step.

Mac & Linux users:

Open the terminal and navigate to the game directory

Run the following commands to allow the OpenMohaa files to run:

isMac() { [ "$(uname -s)" = "Darwin" ]; }

if isMac; then
  # Remove quarantine attribute if it exists
  # xattr -rd com.apple.quarantine ./
  if xattr -p com.apple.quarantine launch_openmohaa_* omohaaded openmohaa >/dev/null 2>&1; then
    xattr -rd com.apple.quarantine launch_openmohaa_* omohaaded openmohaa
  fi
  # Make the files executable
  chmod +x launch_openmohaa_* omohaaded openmohaa
fi

🎮 Part 3: Playing the Game

Step 5: Launch MOHAA

Now you can launch any of the following:

launch_openmohaa_base for the base game
launch_openmohaa_spearhead for the Spearhead expansion
launch_openmohaa_breakthrough for the Breakthrough expansion
omohaaded for the dedicated server (more on this in the server section)

Basic launch:

./launch_openmohaa_base

Custom resolution example:

./launch_openmohaa_base +set r_mode -1 +set r_customwidth 1920 +set r_customheight 1080

⚙️ Part 4: Configuration & Customization

Step 6: Locate Configuration Files

The OpenMohaa local configuration folder is located in the following directories:

Windows: C:\Users\<YourUser>\AppData\Local\openmohaa (or %APPDATA%\openmohaa)
Mac: ~/Library/Application\ Support/openmohaa
Linux: ~/.openmohaa

For now, we will customize the omconfig.cfg file to set some options, which is located in OpenMohaa's main/configs directory.

Launch the game and then exit it to generate the omconfig.cfg file, or copy the file from the repo to the same location.

Exact path to the file:

Windows: C:\Users\<YourUser>\AppData\Local\openmohaa\main\configs\omconfig.cfg or %APPDATA%\openmohaa\main\configs\omconfig.cfg
Mac: ~/Library/Application\ Support/openmohaa/main/configs/omconfig.cfg
Linux: ~/.openmohaa/main/configs/omconfig.cfg

Step 7: Customize Your Experience

You can customize the game by editing the omconfig.cfg file, which contains various settings for graphics, controls, and gameplay.

🗺️ Adding Custom Maps

Check out our Maps Guide for more information!

🖥️ Part 5: Server Setup (Optional)

Want to host your own server? Here's how to get started!

Public Internet Server

You can install it on a remote server and play online with friends worldwide.

Quick setup steps:

Make a copy of the game folder to a new directory
Download the OpenMohaa release for your server architecture (Linux x64 is recommended)
Extract the files into the new directory
(Optional) You can remove all music and video files from the main, mainta, and maintt directories to save space
Create a server_opm.cfg in the main directory (or on the server's ~/.openmohaa/main)
- Use the contents from Base or Custom
If you want to include any custom maps, you can place the .pk3 files in the main directory of the server folder (or on the server'same ~/.openmohaa/main)
Copy the folder to your online server using scp -r /path/to/server/folder root@<server-ip>:/server
SSH into the server: ssh root@<server-ip>
Navigate to the server folder: cd /server
Run the server: ./omohaaded +set com_target_game 0 +exec server_opm.cfg
To run the server in Docker, you can use the following simplified command: docker run --name mohaa -d --rm -it -p 12203:12203/udp -v $HOME/.openmohaa:/root/.openmohaa -v $PWD:/server -w /server debian bash -c './omohaaded +set com_target_game 0 +exec server_opm.cfg'

⚠️ Important: Remember to update your server's firewall to allow inbound traffic on ports 12203 & (12300 if you enabled GameSpy).

📖 Need more details? Check out our comprehensive server installation guide.

🤝 Community & Support

🐛 Found a bug? Open an issue on GitHub
💬 Questions? Join the discussion in Issues
🔧 Contributing? Pull requests welcome!

🗺️ Roadmap & Future Plans

Coming Soon

🐳 Enhanced Docker support for easy server deployment
📦 Automated setup scripts for both local and server installation
📁 Improved file organization separating game files from customization
🔄 Auto-restart server on configuration changes
🌐 Public file hosting for easy map downloads
🔧 One-click server initialization scripts
🖥️ Itermocil integration for easy terminal management

📜 License & Credits

This guide is for educational purposes. Medal of Honor: Allied Assault is owned by EA Games.

Special thanks to the OpenMohaa project team for keeping this classic alive!

a-magdy/install-mohaa.md

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