DOSBox emulates an old Intel x86 PC for running many old MS-DOS games – including the original The Settlers 2, the first computer game I ever played, but which unfortunately no longer runs on modern computers and operating systems.

The German edition of The Settlers 2 is freely available here. Simply download and extract the content into a folder, for example: /Applications/Siedler2/.

After installing DOSBox:

1. Open DOSBox application
2. Mount folder where game is installed: mount C /Applications/Siedler2/
3. Navigate into mounted folder: C:
4. Launch the game: S2.EXE

You can press Option-Enter to enter full-screen mode in DOSBox. Press it again to switch back to windowed mode.

You can also configure DOSBox to automatically mount folders on start-up. In the [autoexec] section of the DOSBox settings file /Library/Preferences/DOSBox 0.74-3-3 Preferences, add:

mount C ~/Applications/Siedler2/

For more details, see the DOSBox wiki.