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Thanks, NuSan. 

I downloaded the d3d9 thing, and tried putting it inside pretty much every folder I could think of, but nothing seemed to happen. Do I need to rename this file, and/or replace an existing file with it? Forcing a command doesn't mean anything to me, I'm afraid.

Hi, the d3d9.dll file should be placed in the folder you put the game, just beside the FragmentsOfEuclid.exe file. For the command, you can try downloading this file I made for you : http://lezanu.fr/FragmentsOfEuclid/ForceD3D.bat and put it at the same place (beside FragmentsOfEuclid.exe) and double-click on it. This should launch the game and force using D3D9. But I don't know if it will work and if it don't, I'm out of ideas.