Open your main COM3D2 installation directory. Look for a folder named Preset . This is where the game reads and writes .preset files.
Let's look at how the vanilla game expects you to handle presets. This is the baseline, but as you will see, it is not truly portable.
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Do your presets rely mostly on or a large library of custom mods ?
Are you moving presets between or to a device like the Steam Deck ? Open your main COM3D2 installation directory
Do your presets rely heavily on , or are they mostly vanilla game assets ?
These files contain references to mods ( .tex , .model , .menu files). If you move the .preset file to another computer that lacks the specific mod folders, the preset breaks. A "portable" preset is one that either includes its dependencies or has a structural path that can be re-mapped easily. Let's look at how the vanilla game expects
Temporarily remove mods from Sybaris / BepInEx Mod folder that aren’t widely available. Stick to official DLC and top 50 Scoresu mods.
This means the preset file loaded, but the game cannot find the accompanying mod files. Double-check that your .mod files are placed inside the active Mod or Sybaris directory, and ensure you restarted the game after copying them.
If you want to run the entire game off a high-speed external SSD or USB drive—complete with your full library of presets—you need to make the entire installation portable.