The process is slightly different between SCUMMVM and DOSBox games. Unfortunately, every computer you plug your flash drive into may choose a different letter drive, so we have to write a launcher file that fetches the current location, writes a new configuration file, and then launches the game. Step 4: The problem with Windows is that the symbolic link just doesn't exist properly, so you can't get your games to launch when using a portable drive unless you hard-code the location. This isn't absolutely necessary, but I like to use the newest versions and only like to download them once (instead of copying them into every game folder). Make sure the 'exe' files are at this directory level. I named mine '2 - ScummVM' and '3 - DOSBox' inside my 'GOG' folder to make them appear at the top of my files list (I reserve '1 -' for installs). Step 3: Download the most recent versions of SCUMMVM and DOSBox and extract the contents into their own folders inside your portable folder. For instance, I have 'Beneath a Steel Sky' and 'Tyrian 2000' folders inside my 'GOG' folder. My game folders all sit inside a folder named 'GOG' on my flash drive. You'll know you have the right GOG folder, because it will have a 'DOSBOX' or 'ScummVM' folder inside it.

Step 2: Move the game install folder into your new, portable folder. They don't pack their games as an executable archive, so the only way to get the files is through the install process.

Step 1: Install the game using the GOG installer. You can do this easily for OS X and Linux, too, but I'm only documenting the Windows approach here (the Linux approach is actually easier). I like to keep my SCUMMVM and DOSBox on a flash drive to port around, and for posterity, I thought I would share my method with the community.

Dosbox portable