DOS games on Steam Deck: Here’s the best way to do it

This part’s easy: Tap the Steam button, scroll down to Power, then select “Switch to Desktop.”

When the desktop environment launches, you’ll use the right trackpad for cursor controls, R2 and L2 for left and right click, and Steam+X to bring up the on-screen keyboard.

DOSBox is an emulator that runs classic DOS games on modern PCs, and it’s easily installable through Steam’s desktop mode.

In the desktop taskbar, click the shopping bag icon to launch the Discover app store. Select the Home section in the left sidebar, then type “DOSBox” into the search field at the top. Then, click the Install button in the DOSBox entry.

To streamline the setup process, make sure all your DOS games are in one location. Click the folder icon in the taskbar to bring up the desktop mode’s file manager (called “Dolphin”), which you can use arrange your files.

For this guide, we’ll assume your games are stored in the Steam Deck’s Documents folder, under a subfolder called “DOS.” Each individual game should have its own subfolder within this “DOS” folder, with all necessary files extracted.

Don’t have any DOS games yet? The Internet Archive’s MS-DOS Games collection and MyAbandonware are good places to start.

Inside your DOS folder, right-click on an empty space, then select Create New> Text File…

You’ll use this file to launch one of your DOS games, so give it a name that’s associated with the game, and use .sh instead of .txt for the file extension. The exact file name doesn’t matter, but you could use something like “dukenukem.sh” for Duke Nukem as an example.

Now, we need to edit the .sh launch file to include instructions on launching the game. But first, let’s copy the location of the DOS game’s .exe file to the clipboard.

• Navigate inside the folder for one of your DOS games.
• Locate the .exe file that would typically launch the game. This typically has some resemblance to the name of the game itself.
• Right-click the .exe file and select “Copy Location.”

Right-click the .sh file and select “Run with Kate” to open the text editor. In the text editor, type the following:

flatpak run com.dosbox.DOSBOX ""

Now, in between the two quotes above, paste the location that you copied earlier. Assuming your games are stored in the Documents folder, your text should now look something like this:

flatpak run com.dosbox.DOSBOX "/home/deck/Documents/DOS/darkforces/dark.exe"

Click Save and close the file.

The next step is to make the game launchable from inside Steam:

• While in Desktop mode, launch Steam, go the “Games” tab in the top menu.
• Select “Add a non-Steam Game to My Library.”
• Select “Browse…,” then locate and select the .sh file you just created.
• Select “Add Selected Programs.”

At this point, the .sh file should appear in your Steam library. Right click on it and select “Properties,” and you can rename it to the actual name of the game.

Now, you can either launch the game in Desktop mode to make sure it works, or just head back to Game mode.

Back in Game mode, the DOS game will appear in the “Non-Steam” section of your library.

Chances are the game won’t work with the Steam Deck’s controls by default, and if they do, they’ll likely be out of line with modern controller conventions. That’s where the Steam Deck’s extensive button remapping features come in handy.